How BIG Is The Underground? Undertale Theory | UNDERLAB

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Something you may have never thought about is the SIZE of the underground! While it may seem as if it'd be impossible to work out the exact width and length of the area we explore in miles or kilometres, we can give it a shot! While we're given the implication that it's large enough to hold presumably thousands of monsters, how big is it really? You may be surprised to learn the truth!
Underlab explores the secrets and obscurities of UNDERTALE, that game everyone seems obsessed with. There's a lot of said secrets and obscurities. Like, a lot. It also showcases and explains the lore and story of the game in an attempt to explain, clarify, and perhaps even discover completely new stuff...
Underlab on Twitter: / underlabyoutube
King Mel's music channel: / kingmel
Miridin's theory channel: / @miridin9883
UNDERTALE is a game by Toby Fox
Awesome channel art by FrauLion! / frau-lion
"Best Friend" art by Moofinseeker
Harry Wakamatsu created the UNDERTALE replica fonts used in this video
UNDERTALE sprites ripped by The Spriters Resource community (thanks UnderFail, JamminJelly and ILLUUM)
UNDERTALE OST extended by Elu Tran
Extremely convenient save states provided by HylianAngel
Special thanks to my best friend(s)
Buy UNDERTALE here: undertale.com/ (six out of seven dogs recommend it)

[@KingMusicalMel]

My Kingdom is vast and plentiful! I welcome all who wish to come and make peace! You could have just asked me and I'd have kindly given you a map!

[@wolfie-mask7772]

King Mel mmh Zamora is dead hehehe she got lost in the void again hehe.....but still Mel your kingdom is huge but...why did you ask gaster to help you?

[@weinerhutjunior6311]

King Mel does the underground have an area were yellow stone national park is

[@uwotm8_________877]

King Mel Im kamicatzing a plane into waterfall

[@nimmimcat7266]

King Mel is your kingdom friendly with humans because they like throwing monsters underground for no reason.. Humans are so jealous over monster power...-_-

[@openaardvark419]

Hail to King Mel. May he enjoy a long and happy life.

[@HidanKitten32]

Though a lot of background is fake I do believe the city in the Ruins is real. After all, all the monsters used to live in the ruins so it makes sense to have a city in there. Although, then it makes you wonder how they left. Did all the monsters have to travel through Toriel 's house or was there another way that was blocked off once everyone left.

[@thecitrine1675]

HidanKitten32 well the ruins are all but abandoned, a replica of new home

[@HidanKitten32]

Isn't new home a replica of the ruins? Considering the Ruins was the first and only place the monsters lived until they left? Yes the ruins is abandoned but the city inside it is real, I think

[@mlutra5676]

Maybe the abandoned buildings there are where toriel gets her snails for her snail pie from! We never see them... where we are able to look... >♡

[@ataino]

The city behind is indeed the ruins city, and the new home/capital are replica of the ruins. You can't access it because toriel probably removed the way to that place since nobody lives there anymore

[@jem4830]

Toriel left for the Ruins after Asriel died, so I assume that her home didn't exist until long after all the monsters had left the city. Although, the fact that Froggit and Whimsum and all of the other random encounters in the Ruins are still there makes me think that some monsters stayed in the city, if only a couple.

[@spikemoody1757]

Given mettaton’s ratings, there are roughly 12,000 to 100,000 monsters. Clearly there are a lot of places we don’t explore, though it sounds like the Capital is extremely densely populated, as it is mentioned by a number of characters that it is too crowded, and monsters are moving elsewhere.

[@denzelebarasi]

Actually there are about 12 000 monsters in the underground. You'd know that if you've ever battled against Mettaton EX.

[@denzelebarasi]

So it should Be a pretty big place

[@potatobro-gm2kr]

Denne Penne the monsters are still pretty small though if you ignore the tsundere plane

[@TheKengekiGoomba]

Angry Commenter either way that should still be bigger than a few hundred monsters

[@paulgrotebeverborg1119]

I think even more. I don't think every monster watches that.

[@Bacony_Cakes]

Or more, as the ratings only show the *positive reviews* from the monsters that *have access to television* and *watch MTTTV* in The Underground. That means the ratings screen is not a reliable source.

[@nottrustworthy6361]

I think we're only shown a portion of the Underground. Remember that monsters ruled earth alongside humans once; The population might have matched the humans. Maybe the monsters built the kingdom like ants do: instead of keeping the kingdom just under the mountain, maybe they dug deeper and deeper? I know Undertale Yellow isn't canon, but I liked the idea that Justice fell deeper into a whole new side of the Ruins that we've never seen. Maybe the Underground is like that; branches and tunnels leading off deeper into the ground, so that the vast population of monsters we never see can thrive without it being too crowded. The Ruins boasted a colossal kingdom where the monsters of the Ruins live, but maybe it doesn't end there: Maybe there are new hallways in the places we can't access, that lead to different places! We're given a specific route through Undertale according to where we fell and what directions we were obligated to take. We walked through the Ruins to Snowdin, from Snowdin to Waterfall, from Waterfall to Hotland, through the Core, and then to the Castle. It's very specific, but it can't be limited to just that! I think there is so much more to the Underground we've never seen, important characters we've never met, dangerous puzzles we've never tried. At least, I like to think so.

[@glasspicaro]

Not Trustworthy No. remember most of monster kind was killed in the monster human war. the remaining monsters lived in the ruins until it became to crowded and they moved deeper into the carvern. considering they hit lava that must mean they are already pretty far down. so digging deeper is almost impossible.

[@nottrustworthy6361]

You do have a point! But I'd still like to believe there are maybe just a couple more places around that hold more monsters. I'd love to see them

[@mayamaya6182]

Not Trustworthy You do make a good point! xD love the theory(we meet again lol if you remember me)

[@nottrustworthy6361]

Undertale Kitten Oh, hi!! Where'd I see you again?

[@mayamaya6182]

Not Trustworthy In a Livestream I believe

[@JAMESGamingLV2]

Q. How big is the underground A. Big

[@grim-2363]

Y E S

[@selinnazsur2328]

I still do think the caverns are fairly bigger than just a small cave the size of a theme park. Why? Weather. There is weather in the Underground, which isn't possible without air circulation like on the surface. But it does snow and rain, so there IS air circulation, it's big enough to allow that. There are caverns in real life that are so big, they have their own weather, clouds and all. I think the further you go, the deeper the caverns become, allowing for lots of room and also it wouldn't be that easy to harness energy from magma if Hotland wasn't the deepest area. Also Snowdin Forest likely isn't a decoy or an illusion, because when you go to the door inside the forest and look down at the cliff right next to it, you can see a tiny house in the middle of the forest and someone actually comes out of it, walks around and goes back in. There's smoke too. I think it's the real deal, the caverns are hella big. I think the problem isn't the size of the caverns, there's plenty of room but the settlement isn't dispersed equally, like on the surface. Cities are packed full of people while rural areas/forests go emptier. Or maybe monsters aren't able to live in the cold damp forest or the frypan lava paradise because they aren't as durable as humans, biologically and on a molecular level. Anyway I think the real problem is resources. Monsters can't last forever without the sun and the lush harvests it brings, they need it as much as we do. Or maybe there isn't enough oxygen or clean water.

[@glasspicaro]

Selin Naz all of that is wrong. let me science soem shit. Sur Son Doong is a cave in Vietnam and is the largest known cave in the world, it’s carved out by a river eroding the limestone. It is 9 kilometers long, going deeper and deeper, with holes in the ceiling that allow sunlight to shine in growing entire forests with vegetation. just like the hole you fall into in Undertale. The cavern is so large that clouds form inside it, causing it to have its own dynamic weather systems, it’s entirely possible that such a cave in a colder location could have snow form and fall inside the cave. Of course, if such a cave managed to erode past the limestone layer and reach a volcanic vein, such a location like Hotland could indeed exist. so caves like the one in undertale already exist.

[@Seriously_Unserious]

Yet another example of where fact is stranger then fiction. Another thing to keep in mind is there are edibles that rely on darkness, such as mushrooms and certain other types of edible fungus. I'd imagine any society forced to live underground for long periods would adapt their agriculture to fungus farms as a major source of nutrition, and considering they're able to make technology like the CORE and lasers and such, they could also make hydroponics to supplement their diets with surface any surface crops they can manage to get seeds for and grow hydroponically. The CORE shows they have access to the technology, ingenuity and resources to accomplish that. As for the crowding into New Home, given the conditions of the other major biomes they have to choose from, it's not surprising most would choose New Home, which seems to be one of the only 2 temperate biomes available to them, the other being the ruins, which were, of course, locked by Toriel after the death of Asriel. So only New Home is left as a viable temperate biome. The rest are arctic Snodin, swampland of Waterfall and super-heated desert/badlands of Hotland. Remember what happened to Undyne when she chases Frisk into Hotland, she collapses from severe heat exhaustion/stroke almost immediately. Many others would also have similar problems from the heat. The extreme cold would be just as bad for many other monsters too. That was part of what trapped the Spiders in the Ruins is that the Snodin climat would kill them. I'm sure we can all imagine how long a Vulcin could last in Snowdin before getting severe hypothermia, or Waterfall's extreme wet for that matter. Or how long a Snowdrake could last in Hotland before suffering a similar fate to Undyne.

[@selinnazsur2328]

+Romeo Fain That was exactly what I was talking about, dude. Underground is a cavern most similar to Sur Son Doong. I don't know why you said what I said was wrong if we are telling the same thing...

[@selinnazsur2328]

+Jason Ross The last part was what I was saying by "monsters aren't able to live in the cold damp forest or the frypan lava paradise because they aren't as durable as humans, biologically and on a molecular level". We have seen a lot of elemental monsters that would die in biomes with conditions opposite to theirs. Humans could survive because we obviously do even in real life, our bodies are more complex and tightly built than a monster's, especially the elemental ones. Plus we got used to surviving. New Home and Ruins seem to be closer to the surface than the other parts, being the start and end of the caverns. The deepest area must be Hotland because magma, Snowdin is understandibly cold because cavern=no sun, and Waterfall is mild and damp because it's in between. As for the plants, they do have plants growing in the Underground that would probably die off/adapt and look different without the sun, like the cactus in Toriel's room. Cacti would grow bigger leaves without the sun, yet they look the same...? Or the Golden Flowers, maybe. Or the typha. Typha needs full sunlight to grow. It's strange how they can grow some of these plants, but they do anyway.

[@glasspicaro]

Selin Naz Sur nope. There so many things wrong with what you have said. So nope.

[@golfgti2300]

idea for the next video: population of monsters/how much monsters are in the underground (remember mtt ratings and monsters who come with alphys on geno)

[@funtimefreddy2991]

Wazkok i think its 10 thousand or more

[@germancat429]

@@funtimefreddy2991 probably a lot more than 10 thousand because on mmt ratings the max is 12 thousand and not everyone watches him (I think)

[@whisperghost9940]

theres 12,000 monsters

[@ashfur6719]

I do wonder if there are other areas in the underground that we haven't seen yet. It would be interesting if someone made a fan game to explore the capital.

[@amosimo8527]

well there are places we never visit such as the forest in snowdin the capital the ruins background the place alphys evacuated mosters to etc... sooo yes there are tons of places we never visit

[@Zorro9129]

Not to mention the implied farmlands where the monsters would necessarily grow their food.

[@supahkoopah2919]

Amo Simo I think it’s safe to assume that Alphys evacuated everyone down to the True Lab.

[@dfcsy595]

@@supahkoopah2919 Nah.

[@willowbillow2078]

I never expected to see a MoonKitti joke here. Respect though

[@thorenthal6698]

5:30

[@casper-vv6lx]

Who doesn't need notifications because he is on KZbin all day long? 😂😂😂

[@curiosityscauldron6334]

Hatsune Miku Greek me! I go on the homepage and see so eine I'm subscribed too has uploaded and *HOLY SHIT!!! clicks faster than sonic*

[@Yatsurask]

me...

[@darksungamer4163]

opa kita na dis kai kapios alos elinas blepi underlab

[@cammyden6126]

Hatsune Miku Greek sadly not me ;( skool causes problems

[@sandjgaez257]

me! I think I have a problem

[@beterbomen]

Actually, Papyrus only said the bridge we walked on was a rockface painted by him. He said nothing about the landscape. When you move over that "bridge", the background moves at a different rate than the foreground, which indicates that it is at least a fair distance away.

[@Underlab]

No wonder the monsters are so eager to escape! What do you think? Do you agree with me, and if not, why? Let me know in the comments! If you particularly enjoyed this episode, please like the Reddit post! www.reddit.com/r/Undertale/comments/66qnwd/how_big_is_the_underground_undertale_theory/

[@charliemcrobb2791]

Underlab, good video, keep up the great content

[@obadashark4880]

41th comment

[@darwinburns702]

look at my suggestion on your last​ video

[@danno3321]

Underlab Great video, but I think the underground would actually be smaller than what you concluded. As you mentioned, frisk is a child, and most children don't walk as quickly as the average person. As a result, frisk would travel less distance in the 8 hours you used, meaning the underground would be even smaller. I don't have the exact numbers for the average walking speed of a child so idk exactly how big the underground would be, but i think it would be smaller than you concluded

[@rhofman1958]

Underlab hey

[@maxzapsgamingzepzeap2337]

I mean for all we know, Asgore could've had some sort of mining team to help expand the area of the Underground, after all if it truly was so small then I have little doubt there would probably be a designated team who would help excavate the surrounding areas in order to make the Underground bigger, perhaps getting rid of excess rocks and dirt by throwing it into the lava in Hotlands

[@Rexy_THE_T-REX]

Well good idea

[@mill2712]

Though I'm curious if there's a range on how far down or outward you can dig. There's still the barrier. I wonder if it closes of that one area by the throne room or it surrounds a significant portion of the entire mountain. If it's the second option then there might be a certain distance out you can dig before you reach barrier. If not, they could potentially dig themselves out. (They could also theoretically get out where Frisk and other humans fell in unless there's a barrier there too.)

[@aceitedeolivas1997]

I think the Underground is quite big. I like to think about Mt. Ebott more as a volcano with various escape pipes, or entrances. Also, I think the Underground is a circle shaped cavern, with the center being the Ruins, and Snowdin, Waterfall, and Hotland/ CORE around, and the Barrier at a side of the volcano

[@Sakine-animate]

where did you get the idea that Papyrus painted the background on a giant rock? that's something I've never heard before.

[@vaimantobe3034]

Sakine I think he tells it to you when you call him there. Apparently it was a rock formation he painted to look like a rope bridge... somehow

[@Sakine-animate]

interesting. I'm getting a new desktop tomorrow, so I'll be able to finally do my own playthrough soon. And one of my goals was to call Papyrus in every room

[@glasspicaro]

Sakine if you call him when next to it he says that. do research next time.

[@mlutra5676]

CoolDude 95 Maybe you should look at the other replies before commenting! Someone else already explained that. Plus, they say that they haven't ever heard that before. They don't have to go researching everything. They were just stating that it was new information to them.

[@supahkoopah2919]

Vaiman tobe Maybe he just painted the rock formation to look like a bridge, and the ropes he added on just for looks.

[@noromantichero]

Underlab. I'm sorry I can't donate... I'm currently inable to donate but, I hope you stay determined and carry on this amazing channel!

[@azzybeatz5966]

You are not alone

[@KnufWons]

My understanding of Papyrus' bridge was that the rock formation was a natural bridge over a chasm: the chasm you see below.

[@concordiaharmony2302]

I always thought the underground consisted of at least ten thousand monsters because of the Ratings during Mettatons battle.

[@iamnotokwithworms]

if it's about the size of a continent, can you imagine being a small child having to walk that far?

[@vaimantobe3034]

Hello Underlab! Although I mostly agree on your conclusion, there is one thing that doesn't seem to add up. There's snow in Snowdin. not just ice, but snow that's fresh enough to allow the skelebros to make snowmen. I've heard that a possible explanation could be that in very large caves a whole ecosystem can exist -if they're large enough. What do you think? does this mean snowdin must have a high ceiling or something? Maybe Snowdin's snow would be a good subject for a future video or something?

[@ninjapotatolorf6237]

Idea for a video: Try to assign Human Soul traits (Patience, Bravery, etc.) to the many monsters of the underground.

[@glasspicaro]

NinjaPotato Lord he already did that.

[@ninjapotatolorf6237]

He only really did that for all of the Skeleton/Ghost characters. You guys do realize that there's other characters besides Sans?

[@glasspicaro]

NinjaPotato Lord shut up. that's not the one I'm talking about. no need to be rude.

[@ninjapotatolorf6237]

Romeo Fain Sorry. I was just joking. Didn't mean to make you upset. So, he actually did a video about this exact thing. Cool! I'll check it out. Thanks.

[@glasspicaro]

NinjaPotato Lord 👍

[@boiaaangccus7035]

you could figure it out *game theory* style and take all of the rooms and map them out and try to figure about how tall frisk is and mapping them across the room, count up the number of frisks that take up the room and multiply from there.

[@TheFreshestResh]

You know, I have been getting your vids in my recommendation for a week and I felt like I wanted to help you out in the time you probably most need it👍. You got a new sub😊

[@bluewhaleking6227]

There are probably a lot of shops and guards in New Home that we never see, as it appears the city goes on for a while.

[@dongkaizhang8184]

I'm so glad that you still make vids. Stay determined and keep on rockin hard.

[@neillking]

Hopefully this channel keeps on growing, as your channel is entertaining and generally enjoyable. I hope that donations and earned money keep you going.

[@KikoBean]

The mountain off to the left is in fact NOT Mt. Ebot. Ebot is rounded more like a hill, this mountain in the background is steep and pointy, suggesting that its a completely different mountain altogether.

[@willowbillow2078]

The monster souls seen at the end aren’t absolute. A large chunk could have been cut off by that white light, or that white light *is* souls that are so densely packed they look solid

[@JSheerXeno54]

did anyone forget that the core is directly under new home? that means when you see newhome from waterfall and the core from hotland, your probably stand in about the same place, just lower in the underground. this means that hotland is under new home and waterfall. when going through waterfall, we go downward deeper into mt Ebott, finally when you face off against Undyne, behind her is a smaller cave that leads under new home. the underground has 3 levels to it. each level is deeper then the last. this explains why theirs lava in hotland. you must go far underground to reach it. we can assume mt. ebott is an inactive volcano, which explains it's shape and the size of the cave inside it. trees grow there because of the ashes that are in the ground. it has greatly cooled explaining the build up of snow, it starts to melt the closer you get to the bottom of the underground which has tons of lava in it. as far as it goes, the ruins are under snowdin, snowdin is next to waterfall, which is on top of hotland just outside of new home. (this explains why Undyne can live here.) because what royal guard captain would live on the other side of a lava pit if its really close bye. anyway. hotland is below new home, another good chance is that the ruins and new home are right next to each other, because it's odd they abandon an entire city just to build an exact replica of it across a cave. so in that way, the underground is tiny. mt ebott is probably the size of mt st Helen (they look similar too) just look up mt st Helen and check out the size of it. that is how big the underground probably is.

[@ValensBellator]

I assumed it was somewhere between Lichtenstein and Luxembourg in pop and size. That city is clearly quite large, as is the castle. I think there’s a good deal more to it than we got to see.

[@VikingBoyBilly]

Hold on there, Underlab. There's a background outside of the Mystery Door area (I think) where you can see a little monster in the distance running back and forth from a tiny house. That can't be just a painted background, can it? That part really made me want to go over there and meet him and feel frustrated that I just can't. I love it when games hint at things just out of your reach like that (I probably put more thought into that one than the mystery door itself)

[@fishfinger1699]

Im so happy u didnt stop uploading

[@karam1oo384]

I like your videos and I will be supporting you for ever! Underlab, stay determined :)

[@cappedlevel3792]

Hey man! I like your Undertale videos a lot! Please dont stop making these videos! *your the best*

[@AmyraCarter]

I'm sure that the Ebott Underrealm is larger, but, there are surely, larger underground areas in existence, like *_Blackreach,_* to name one; I've gotten lost in Blackreach more than once. Of course, glowing mushrooms are always appealing to see...

[@johnlewisbrooks]

Another thing to consider is the battle between humans and monsters. It says the monsters were simply overwhelmed, indicating further of a smaller monster population.

[@toad6284]

Probably the size of a midwest county and we only see along the main road that cuts through the county.

[@zachcrawford5]

25 x 25 miles (or 40 x 40 km for the rest of us) Is still pretty big and would take a long time to fully explore on foot especially when that consists of broken up spaces like caves, forests and urban areas (which are in the caves). The city of Toronto is just over a quarter this size for reference.

[@minorinsomniac2114]

Thanks for making this video I've always wondered this

[@MesozoicAngel]

I don't think the backgrounds are paintings, because you can literally see the big forest in other parts of Snowy, the reason why there isn't any town in there is because is not necesary living in the cold, when they already have other places like the capital and the city in Waterfall

[@umyum3858]

I'm pretty sure UT Yellow will feature more of the underground, as it is being considered canon.

[@umyum3858]

Well so far, there's nothing said says it COULDN'T have happened.

[@amosimo8527]

UT tellow is fanon and nothing tells that there would be a vampire shy guys etc....

[@glasspicaro]

ispguy Canon means something made by or approved by the orginal creator. and undertale yellow is not. so stop saying stuff like that.

[@funtimefreddy2991]

CoolDude 100 look the wikia

[@KC_Garcia]

@Coldpyramid 66 idiot, Yellow came BEFORE frisk

[@JarodJL]

I think it is bigger then what we see...but still rather small. After all there are a lot of Monsters we don't ever see the homes of. Also, you are one of the first people I will be supporting on Patreon once I have a job again :P

[@themeemurbros7980]

wait. when you fight mettaton you actually have viewers so pretty much what I'm saying is there is about 10000 monsters.

[@amosimo8527]

i saw a game play where peeps reached the 12000 viewers

[@thecitrine1675]

Alphys watches human anime, maybe humans watch Metatons gameshows... Probably not but it is plausible

[@NetMoverSitan]

His wouldn't look too out of place in Japan.

[@Cressy4851]

The Meemur Bros Isbt ratings different from viewers

[@willowbillow2078]

And that doesn’t mean everyone is tuning in. It could be as high as 20,000

[@desertedstream]

MORE VIDEOS? THANK YOU THANK YOU THANK YOU SOOOO MUCH I LOVE THIS CHANNEL

[@jinxcast8114]

Plot twist: Frisk took the shortest short cut there was: a direct path to the right/left. (depending on your view) There's actually many cities in the Underground. We just went the way that let us get through in a quick amount of time.

[@ragingcheeto6998]

You are one of my favorite KZbin channels ever I don't want you to quit your channel or I will be heartbroken Undertale best RPG ever

[@RebelLRadar]

the population of on-screen monsters is something around this Ruins population -- 23 monsters Snowdin population -- 35 monsters (about 55 at the end of TP) Waterfall population -- 34 monsters (about 44 at the end of TP) Hotland + CORE population -- 59 monsters (About 68 at the end of TP) Amalgamates -- 67 monsters (amalgamated together, 0 after TP) Misc -- 3 monsters (Napstablook, ASGORE, Flowey) Total metioned/on-screen monsters: 221 monsters

[@rpggriffin]

Wait, Papyrus _painted_ that bridge? I'm not convinced of that, because the bridge parallaxes with the background. The city in New Home also parallaxes as you walk by it. Keep in mind that you pass WAY more monsters than houses. There are numerous school kids by the CORE, which implies that there's a school somewhere. In other words, there are almost definitely building that you never interact with. There seems to be entire towns that you never see. All of those hundreds (thousands?) of monsters need to live _somewhere_, right? If there really were only a few houses in total, they would be PACKED. Sans and Papyrus wouldn't be allowed the luxury of a middle-class house all to themselves, I wouldn't think. If space really was THAT sparse, would the monsters really give up "Home" so easily, and let it fall into ruins? I would think that they'd bust down that door and reclaim some of that living space. Food. Yeah, monster food is weird, but they still HAVE food, and lots of it. That requires crops. That requires farming, which requires farm land of some kind. It's probably done with hydroponics via the power of the CORE, but we never see a single garden, much less enough fields to sustain a multi-thousand monster population. Okay, there's the snail farm, but we only see a few actual snails. I doubt that "farm" could sustain Toriel, much less the entire population. (besides, every other monster seems to be a vegan. Why ARE the royal family members the only monsters who eat another animal as food. Do you think they poop?) Sorry, but Underland really is FAR more expansive than the monsters want you to know about.

[@webaccount284]

There's a garden in asgore's castle.

[@antares946]

Lol i love your content mate you do such great content you keep my day up and i am SO HAPPEH WITH YOU NOT leaving youtube

[@rucealexander2848]

another thing that might support your theory is the newspaper. they say that there is so little that goes on in the underground, that they just fill the newspaper with games also a monster mentions that the biggest and only star in underground has a fanclub with only 36(?) members. which is very small for the number one star of an entire community, perhaps this pertains to the size of the population as well there is also the underground river that spans through most of the underground, carrying blocks of ice from snowdin to hotlands without the ice melting. i would think this would be very small as well.

[@AveryShort-kg4pt]

Concerning the point of the core- it should be noted while most geothermal power plants run off of steam, it seems to run straight off the magma, considering it’s like… right in it. Idk how much energy that would make tho, but we also don’t know how magic electricity translates to real electricity

[@reiheath8885]

I've always liked the idea that the Underground was a big place, maybe not as big as London or anything but big enough that it would take days or weeks to actually go through the entire place, especially when you put yourself in their shoes. not to mention the little things you need like food, drinks, bathrooms, and over all wanting to spend time with the monsters I would believe it would take quite a long time to get through but that's just my opinion.

[@killedtheradiostar1116]

Actually onion san is not the only one who mentions a city. In the mtt hotel one of the monsters say ‘’The elevator to the city is broken” and some guy in snows in says that again the city is getting crowded and they are planning to move to snowdintown so the areas we adventure seem to be mor like the outskirts of the underground

[@SilverJ17]

Also, I'm still a little curious on whether there's other 'Undergrounds' located around the world. Were ALL the Monsters sealed Underground under Mt. Ebott? What about other continents? I'd imagine Undertale's world would have continents.

[@apperushredder]

I think there are other undergrounds too. maybe there are even monsters on surface that live in secret from humans

[@mill2712]

It would make you wonder if that's true. If the monster population wasn't that large to begin with (Or the genocide was highly effective.) then there likely weren't other undergrounds. Then if there are other undergrounds, what are their states of being or how many exist? Might be possible the underground we play in is the largest and most advanced and all the others are smaller and/or much worse off. (If they aren't flat out ghost towns due to many if not all of those monsters dying out.)

[@SilverJ17]

Well, Undertale Yellow, a fangame, actually does explore some of the ground we might have missed. I'd imagine if we ever get any more 'soul' games, official or fanmade, there's a lot of ground we likely never covered in Undertale itself.

[@diegocalderal]

I think that the places that we see in the background that are unexplored are real locations and the underground has the size of a country (a country in the size of the US, Brazil, Australia and India). Papyrus mentions a beach in the game and he mentions a location with "green grass" in the recent Deltarune newsletter (although people connect it with Hometown from Deltarune).

[@flidrl]

I like the notion that maybe the mountain on the Horizon is Mt. Ebott and we had travelled to another mountain

[@mill2712]

It makes you wonder if there's a barrier there as well?

[@smeerkaasfabrikant6721]

Dandelions aren't red Tulips aren't blue Toby fox is never Making Undertale two

[@cyberooski]

smeerkaas fabrikant lol

[@betsareoff6821]

Roses are red Here's something new Violets are Violet Not flippin blue. Well, Violets are a shade of blue but meh

[@laststorm1279]

smeerkaas fabrikant it's up to the fans to make undertale BY FAN GAMES

[@snekshex5562]

Sunset Bow a voilet isnt blue its everything but blue, blue reflects off the flower into our eyes

[@user-ub4my9ws4c]

Sunset Bow They said so in their comment that violet was a shade of blue. Are you one of those people who don't click "read more"?

[@MinecraftWhofan]

Do a theory about how there are so many different species of monsters. I mean, they started out as a crowd of survivors from the war as said in the non-anime history books, and they eventually grew, but how were new species of monsters created?

[@applesgaming-canalinchis434]

this channel is cool

[@amosimo8527]

this channel is awesome #LoveFlowey

[@MurdocsMinion]

There are at least two more royal guards that didn't get featured in the game. RG 3 and RG 4. They were removed because their fight felt too redundant from 1 and 2. The fight was fully programmed, if you look it up.

[@jem4830]

Great video! I think it is fairly small, with a few hundred monsters, but I do think that both the city in the Ruins and the forest behind the bridge in Snowdin are real. We know that monsters used to live in the Ruins in a city (confusingly called Home) so it makes sense that that is it. Also, Papyrus says that he paints over a rock formation, not a rock face. This makes me think it's just a natural bridge made of stone. The Underground is probably a bit bigger than it looks, but still probably no more than 100 square km.

[@connosu_]

Love your channel UnderLab

[@stephaniecuellar3192]

How snow gets underground aside, the indication of a bigger size is hot land is much closer to the earths molten center than the wetlands which lay in the crust. If Cara/Frisk fell thru the top if the mountain, then perhaps that Frisk is going downwards as he progresses.

[@Vorcupine]

I know this video is old. But you'd be right, but the thing is... With the mention of the capitol and Toriel having gone literal grocery shopping, it'd mean the backdrop seen in the ruins is read and it is just a large city. With that we can infer the others are real too.

[@iamhappythingy9258]

The walking distance from the end of the world to the start is about 20 minutes, so im guessing that's about, like, a kilometer based on google maps. Including all of the scenery and city we see, it's probably less than 10 km2 in total. And Frisk walks at a preety average speed, since she walks a triple/double sized bed (toriel's room) in about half a second.

[@stm7810]

good point about the journey time, with a spherical barrier that based on those numbers, has a 40Km diameter the volume ~=~ 18000Km^3 though with the space bending shown by the houses being bigger on the inside and dimension boxes it would be more like having 25000Km^3 to work with and with overpopulation and cities in the ruins and in the distance as well as the ratings reaching 12000 I like the idea of a population above 20000.

[@IronyExtremist]

I consider it to be fairly small for all the reasons you described, but perhaps expands a bit further than we may think, since where do you think the Underground gets all of its resources from for its citizens' day-to-day life? Something tells me it can't all be only from the surface alone like with Anime. Sure, electricity and energy comes from the CORE, but what about food? Although Bratty and Catty collect stuff they found in the garbage and MTT-Burger Emporium's food seems very sketchy, surely there's something else that's keeping the monsters fed down there. Perhaps a few in the capital and some farming areas in a few places where we don't explore, but I don't think this makes the Underground a lot bigger. Only a bit, since you don't require too much land to keep a few hundred/thousand people fed.

[@GoodName111]

Near the enterance of the cave where you encounter the secret boss "Glyde" there is a vast view of the forest and you can see small house and someone going inside it so its not a painting.

[@kirstyshadowdancer5095]

Okay so under my theory - Actually sat down and did the maths just now. I come up with a known population of 186 Denizens SHOWN. Assuming these numbers represent between 5% and 10% of their given area: we get a Grand Population between 1800 monsters and 3600 monsters. Certainly not a country but at least a large town - all contained under a mountain. The Maths: Grinding 20 + 16 + 18 + 40 monsters ++ every minor NPC that's 12 (waterfall) 13 (Hotland) 11 (MTT) 22 (Snowdin), 4 doggy guards, 2 armor guards and 6 frogs ++ named; Torial, Papyrus, Undyne, Dummy, Muffet, Napster, Riverperson, Monster Kid, Mettaton, Sans, Flowey and King Asgore, the octapus, so sorry and Jerry + Temmies Minimum of 6. ===== 186 SEEN characters.

[@Bugretti]

good to see your better

[@zachcrawford5]

I'm building a replica of the underground in Minecraft (I've spent about 7 months on it so far). I tried to scale it so that Frisk would be a little less than 2 blocks tall (the size of a minecraft avatar). The map is looking like it will be ~6000 blocks long. It's hard to say how tall Frisk (I've heard everything from 1 meter - 1.6 meters , I guess it depends on the player much like their gender). That would make their journey from where they fell to ASGORE'S throne room between 3 and 7 kms (as a yellow bird flies).

[@sachascharovsky1632]

I'd love to live in Snowdin

[@songdaniels9960]

the capital city is one of the places you never explore in undertale, you just see ASGORE's castle, there are monsters in the distant buildings so there's definitely a populated city in New home.

[@Xami385]

Some of the secret characters says that there's big city.

[@alc4528]

An interesting topic to cover could be how big is the monsters army cause they apparently went to war with the humans but all we encounter in the game that seems like soldiers are the K-9 unit undyne, two guards and sans and papyrus

[@lightningstrike885]

Omega3.0 Animations actually, there also is some possible royal guard members, such as Lesser Dog, Greater Dog, and Doggo

[@alc4528]

Geti Sopa ya but aren't they part of the K-9 unit

[@spinach4892]

From metaton we find that there’s 2100 people in the local area of the underground plus there’s LOTS of caves that are big enough to fit a FLYING SUPERJET

[@Brosethorns]

you should make a video about areas we didnt get to go to also where did u get that map

[@randomperson._.5699]

I noticed that the Mettaton telling us to "choose already" in the end (even though we just got to that part of the video) is coloured.

[@MrBlinglord]

Well we all know Toby Fox is the kind of guy who pulls stuff like that. Like the "rope bridge" is just a legendary painting made by The Great Papyrus! Yep, I'd guess he just made it this way as a joke. (Btw I thought the bridge was real at first lol)

[@mena_wolf]

Something to take into account (but also maybe a theory for another day) is where did Dr. Alphys evacuate the monsters to on the genocide route? Food for thought.

[@pungorma]

THANK YOU for not quitting

[@archmageshane]

one minor detail that *might* disprove this: during the genocide run were does alphys evacuate everyone to? I know a few stayed behind but there *were* more. (also another thing: how does the death of 98 monsters and a flower destroy the timeline? I mean, there were still all the other monsters and all the humans, like, what the hell?)

[@vaimantobe3034]

deathbringer 1 maybe the true lab. Hotland also has some parts of the different levels that are inaccessible by barriers during a genocide route. Also, Underlab didn't say that what you see is all there is. Just that it's not that much larger than what you would expect.

[@sumachendominguez2064]

i noticed something the ink in bendy and the ink machine is like determination it makes you live past death it melts you and have scary results

[@bloodangelsheart]

I think the underground is bigger than what we see. Snowin that whole forest below debately does hold other monsters. One screen you can see someone leaving their house that is below the mountains. And all those extra house to can not reach in snowin town.

[@alphasaith8349]

*sigh* Didn't exactly get a clear-cut answer. Good thing I'm running my own experiments, though I've only had the patience with doing the Ruins. Though my research is only done purely on Frisk's height. If Frisk is 5 ft in height (average height of 12 year old human male), then the Ruins (explorable area only) are ~1965 ft in length.

[@k1ttykat_]

COOL

[@Voidbear_FNaF_and_Undertale]

Don't forget that there's two unused royal guards and one unused dog. RG 03 and RG 04, and Doge!

[@icantthinkofaname7293]

At 5:35, what about the fact that you can see someone next to a house rarely down there?

[@SK-by6qd]

Neutral can be beaten in under an hour. Also, how would the rope bridge be a painting if there's collision boxes on the top and bottom of the bridge?

[@fledthehunter5293]

I think that there are at least 10000 monsters under that mountain, because in MTT´s fight there is ratings and it can go over 10000 so there must be at least 10000 monsters under there

[@Solesteam]

wait if the giant forest below in snowdin is fake... what about that tiny house that someone actually goes in and out of near the cave the secret door is in?

[@cerulean22b69]

what are your specific thoughts on Suzy? I'd love to see an episode for her and speculation on what role if any she may play or on the possibility of more being added to Undertale.

[@Riverrocks777]

I don’t Think Susie has any role in undertale ofr any other deltarune au universe at all and is not Barney

[@DazzlingNishi]

I always thought that other mountain is Mt. Ebott! This would mean it's at least much bigger than you suggest...

[@xtracelestial1986]

I accually have thought about this!!

[@vakarisBl]

If the background is "painted" then what's that small moving light pixel in the background at the secret door?

[@Pink_Ruby]

9:25 I thought I heard, "Temmie what you think..." Do you hear it? Like if you do!

[@hilmy2633]

The snowdin shopkeeper says that years ago, all monsters lived in the Ruins

[@NetMoverSitan]

It would put the frame rate at single figures if it was hundreds of thousands. | The CORE might've been for experiments as well as the main power supply, finding other ways to free them. | 5:40 - Transvestite! | It appears that based on the true pacifist ending, they're not as threatening towards monsters as they once were.

[@lichypieruu9747]

UNderlab: there's not a lot of monsterz in Underground Deltarune: *am i a joke to you-*