Tokyo’s Incredible Underground Flood Defence Systems

Catalyst: Tokyo Flood Prevention - Exploring the Japanese capital's vast labyrinth of underground flood defences
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Fifty metres beneath the world’s largest metropolis - the Japanese capital, Tokyo - is an amazing underworld river system. 6.4km of tunnels, colossal water tanks, massive pillars and giant pumps are part of an immense coordinated effort to pump floodwaters out into Tokyo Bay, and protect the city’s 35 millions inhabitants from devastating floods. But with year-round heavy rains seeming increasingly frequent, Tokyo’s flood management - already the most advanced in the world - is being pushed to even greater lengths to protect the population. Mark Horstman goes underground to explore the gargantuan underground world of Tokyo’s flood defence systems.
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Journeyman Pictures brings you highlights from the cutting-edge science series, ‘Catalyst’, produced by our long-term content partners at ABC Australia. Every day we’ll upload a new episode that takes you to the heart of the most intriguing and relevant science-related stories of the day, transforming your perspective of the issues shaping our world.

[@309387421]

The scale and development level of Japanese infrastructure never ceases to amaze me...

[@theabrasileno1921]

When the govt actually cares for their people.

[@TruthShallPrevail4]

Free documentary. All of you quit complaining on video quality.

[@axeman999]

No, quality sucks

[@user-hu1oc6uk8d]

+axeman999 only you

[@user-hu1oc6uk8d]

wtf

[@EpicDyster]

+axeman999 cry some more, little bitch

[@juliezaremskiy3635]

TruthShallPrevail4 ain't free, I still have to pay for internet connection.

[@front2back3]

This is just one more example of the resilience of the Japanese people.

[@trulyinfamous]

The U.S. could be doing this like this... If they weren't spending in excess of 600 billion dollars a year in defense.

[@audimetallica]

Truly Infamous yes ...”defence”.... a shame....

[@audimetallica]

@@namishbaranwal3522 im not takling about that.. How is it “defence” when all they do is attacking every thing around the World ??

[@namishbaranwal3522]

@@audimetallica I get it. You are right.

[@wakuluriel4363]

Very beautiful country and very well governance spending money for the people of Japan not spending too much in guns and other things that can hurt people. North Korea should learn from this country.

[@lifeisneverthesame910]

And 250% debt to gdp ratio is great..

[@penguinexpress12]

This is what you can do when you're not spending money on defense

[@jonmarin1443]

"defense"

[@SpencerHHO]

Japan still has a massive defense budget lol

[@Ruvi5000]

Yeah but this isn't as cool as 100 Aircraft Carriers

[@johnpamplona5082]

Spencer Howard it's still little compared to what th U.S. gov. spends on their military.

[@techblogger8323]

Well before the US even starts building shit like this they have that 20 trillion debt that keeps rising

[@jaames]

In the Philippines, not only do we not have gigantic flood control measures, we also have very smart citizens helping the flood by throwing garbage whenever, wherever, making Manila a huge rubbish bin. :)) Where's my "proud pinoy" squad at? 😂

[@faudanke4459]

I hate being filipino actually I’d like it better if i was japanese :V or british

[@four2434]

LOLWTF673 I bet you'd hate it even more if you were in a country experiencing famine and drought. Just be grateful and make the best out of what you have.

[@joshuasumallo4786]

Resulta to ng Edsa people power ng mga dilawan

[@vm0531]

Dear Journeymen Pictures, just to let you know that when people talk about 720p video, it actually means that the video has 720 pixels VERTICALLY.

[@alanhowitzer]

The Japanese appreciate engineering. In America engineering is an expensive annoyance, please go away.

[@NikorasuChan]

+Alan Fox Murica has social engineering... yeah, useless kind of engineering.

[@superlativeconspable]

+Alan Fox get out of here shit brain your nationality dosent shape your skill or creativity america is still 1# and has been for a long time

[@alanhowitzer]

superlativeconspable The truth is America is an innovative country. However, when it comes to precision and quality, America is second rate. Just look at the quality of our cars and roads, terrible.

[@superlativeconspable]

***** well i dont know about that this man clearly attacked america for no reason and i will defend it. You may say we are poorly educated but in comparison to who? i think your wrong and your quick to take the worlds side against america but really we are in the best position and you should be grateful for that.

[@superlativeconspable]

***** i dont really understand what your trying to get at? i have traveled out of the countries more the 6 times on vacation? ive never been to a military base i believe the army is for saps. i dont believe in war, what are you trying to imply? " a rational though empirical remark"? now could that just mean you know its true but dont fancy saying it because it sounds rather elitist and harsh, well i can understand that. but he clearly said american engineering is an expensive waste i do take offence to that yet your taking his side i dont think you are a real america your probably some milk drinker always standing up for the little guy even though hes throwing the stones your pathetic and are the one Americans should be ashamed about.

[@hiq3908]

Incredible piece of art engineering system, huge and massive. I have been in Japan and I was amazed wlby what i have see by own eyes.

[@chuautesuma]

I am so glad that I came across this channel, I truly enjoy watching so many of the videos. I would suggest it to friends, the only problem is that my friends are not interested in this stuff. :( too bad... keep the amazing work up. Truly enjoyable.

[@nightsage217]

different folks different strokes. At least this video shown us the importance of anti-flood in mega city. It's an asset we cannot afford to exclude yet remained invisible to public.

[@dazza123401]

I feel you brother. The only thing my friends would talk about are parties, bitches and gym.

[@anthonyagnelneri4076]

isaac sanchez a few months ago all you tube was ANTIFA TEARING down STATUE......ect blm...just BULLSHIT and MASSIVE conspiracies

[@distinctloafer]

@@dazza123401 Lolz, that made me laugh. Well I hope you find a friend with similar interest, because I sure hope I do too.

[@Joe321Joe]

JP, please, put year of making of these documentaries in the description. It is an important information with these older ones.

[@TruckTaxiMoveIt]

Excellent thumbs-up left me wanting more

[@AndrewGayner]

Awesome! Thumbs up!!

[@polygamous1]

a Really amazing project but overall they did amazingly well considering the amount of natural disasters against them you got to admire them well done Japan

[@etxeberre1]

Excellent video.

[@chunkylover48]

2:19 i really thought he was gonna hit his head

[@robbie4339]

hahaha same

[@freekitten00]

ﾜﾛﾀｗｗｗｗ

[@NickWheeler9559]

I was just about to type that

[@mikejo8194]

Same

[@manjunaths936]

In India govt. Does nothing

[@patientzero291]

we need this kind of engineering knowledge to be spread out throughout the world specially to countries that flooding is concurrent

[@hankeat]

Jakarta needs to have this one.

[@thestudentofficial5483]

Han Keat Lim no, ppl just need to stop dumping in the river

[@richardoedward7569]

Han Keat Lim you guys are sinking already.

[@idkfin1546]

@@richardoedward7569 so many corruptions in indonesia.Before finishing this project,the money has already gone .

[@michaeldeierhoi4096]

It's to late for Jakarta since they are now moving the capital to the island of Borneo. Hopefully they don't replicate the same catastrophe there. . . .

[@663marv]

This country does not cease to amaze me

[@thomasbroking7943]

Incredible

[@shreyashthapar1362]

SUPERB!!!

[@TTstone616]

amazing

[@rabindrakumarnayak5382]

Needs a book published on this for college students.

[@adrian33161]

“Pet shop” is code word for restaurant

[@begotten59]

Kudos Tokyo! 👍👍👍

[@jimvet5975]

awesome job Japan, one question, what did you do with all the excavated earth & rock,where did put it all.

[@dunruden9720]

They said they used it to build bigger levee banks. You no rissen!

[@jockwood2398]

They dug a bigger hole and put it all in it

[@videoviewer2008]

11:06

[@1994metehan]

We need this not only in tokyo we need this in the hole world not only the flad prevention systems but also the earthquake proofing end overeating solutions like in dubai and other big cities

[@oleskoollover]

Awesome video. Will be showing to me children. I plan to visit Japan someday.

[@gayathrivenu6370]

our state, Kerala , in India is also devastated by flood ..lost roads ,highways ..we want to rebuilt the whole and tis technology finds great.Would it possible to share more details about tis technology so that we can adapt.The details like wther it is applicable in hilly terrians , because half of our state is hilly region, is it cost effective compared to other technologies?We are eager to know more about tis.Kindly share some more details.

[@MikeUIibarri]

Fantastic. And way too short...

[@paxhumana2015]

Places in the USA honestly need a similar system set up in their cities as well. New Orleans would benefit from this system being combined with a Netherlands-styled levee gate and flood control system.

[@Koroodetto]

Wow

[@syafalan6447]

Malaysia also has SMART tunnel.

[@AutoDidact117]

That's some respect for nature and taxpayer's money.

[@ayushpandey7746]

12 minutes of wowww!

[@Space_ace273]

Mirror's Edge flash back

[@keitumetsem1344]

Soa Paolo and California could use some of this rain

[@FARMERJARED14]

Need this in louisianna

[@christianlorre]

For those not on metric, 1530 millimeters is about 5 feet, or 60 inches of rain. That's a pretty large amount...

[@dunruden9720]

Water is measured in litres, megalitres or gigalitres. Gases are measured in cubic metres. Apart from this, amazing video. Compare photos of Hiroshima 20 years after the bomb with pics of Chicago in the same time period. Thought provoking!

[@ElaBellll]

Are you dumb, cubic meters of water will still translate perfectly to any other form of volume measurement, its not wrong.

[@daylilysims]

Indonesia need this 😢

[@linuxboy007]

We need this here in thd philippines

[@dunruden9720]

Perhaps Bangkok could learn from this and fund the sinking city instead of funding the approximately 5000 generals (military and police)!

[@misterkefir]

The music is amazing ;) anyone knows if it has any title ?

[@polarbebear]

darude - sandstorm

[@misterkefir]

old shit is old.. move along

[@marshallmartin1689]

Thinking about Houstons drainage.Wider channels,angled hydraulic pipe effect into main channel.Any ideals WE. need to figure this out.Thank You.

[@As-ky8or]

holy shit thats amazing

[@khryllim9264]

Its great that their government is constantly improving on their cities. Ours is so clogged by corruption even the basics are unstable and insufficient

[@christiantolentino4319]

Philippines needs this

[@MsUltrafox]

1:33 I didn't know Crocodile Dundee went to Tokyo.

[@LonewolfeE5]

Japanese engineering really gets my Tokyo tower lit up

[@Techischannel]

Wich Tokyo are we talking about? To make Choice easier: Tokyo Prefecture, Tokyo District or Tokyo Metropolian Area?

[@BeautyHealthZoneBlog]

A bit like the Thames Barrier.

[@kartikmessner2868]

@10:26 apt background score for the first time humans roll a fatty for the aliens

[@Rogdub]

07:10 he is entering the halls of khazad dum. i bet there is a balrog somewhere.

[@lisaburnett3368]

I think London could utilise this idea very well.

[@14vimalk]

Mumbai desperately needs this

[@georginapreston4171]

it seems by the time the UK builds the HS2 it will be the UK version of the channel tunnel seeing as they care nothing for flood defence over here

[@edcox9859]

Chicago has a similar system.

[@jnsurg947]

Huge underground Parthenon to prevent flood.

[@TheKeithvidz]

idea for my country?

[@mikulas13]

these halls are so big you can find Gandalf with the dwarfs there.

[@heretoshare612]

Check out London Thames flood prevention system.... It's also good like this....

[@heretoshare612]

*****​ no no.. There have built a string of water control systems located on the surface of the water itself. These structures very much control the excess water 

[@ayo3thotsb208]

Sa Sa still better then America lol your government lets you get flooded so insurance companies make more off you😂 and don’t you dare say dams cos you didn’t even invent them not the mention most your great minds behind science where captured nazi scientists from ww2

[@nevergiveafuck404]

Is that music from Blade Runner?

[@IDK-ue1gy]

I have to respect Japan,I mean they have every problem anyone can have yet they are still very successful

[@satifaj2884]

I LOVE JAPAN

[@phillipsmith6606]

Underground flood den fence wonder why it's underground

[@johnharker7194]

Tokyo was shaped by fire more than anything.

[@aeronacabaofficial]

While In the Philippines?

[@medicaldoll5506]

I'm seeing a pattern of misspelled words, so I'm wondering if certain words are just spelled differently where this documentary director/editor is from lol.

[@babymurda9317]

I'm lucky i live in NC we don't get earthquakes or tsunamis

[@evohvoltshinthao848]

What if TITANS attack .. They dont have barriers.

[@khav11]

well he was right, floods have been happening a lot in 2020 just this summer. let's hope we have olympics for 2021

[@raghavendranmouli9964]

Sound mixing is poor. Reduce the BG at least when conversation happens

[@empyrean196]

The mines of Moria, are in Japan, not middle-earth. 7:13Lol

[@kendelion]

When this kind of thing exists yet no one knows, I'm convinced that somewhere under, there's a real life Gundam or Evangelion ready to launch!

[@dragonel88]

0:45, "we kids,we would catch them and then make them fight each other but that pokemon only know splash,its kinda boring so we kept them inside our inhuman pokemon hoarding room till they die"

[@beckyshock3099]

They should've done something like this for New Orleans, as well as other coastal cities......

[@anthonymolina7416]

Becky Shock but the war in Iraq is more important I guess

[@bedziek1993]

Moria in Japan, who would have thought.

[@ambassador.to.Christ]

I feel like I'm playing on a console again...

[@paulgraystone4919]

some when`t to space others underground

[@sugarcan1110]

Would it stop the tsunami if not waste of time

[@s0nnyburnett]

It's like you guys ripped your own video off youtube into a 20mb file and then re-uploaded it.

[@teds4983]

My question is, did this actually help during there big tsunami?

[@hmnanda]

of course! levees and seawalls break the momentum of the waves. 1,000 homes lost is better than 10,000

[@muneerbasheer2073]

I am India but Japan my favt country

[@priyankayumnam9173]

I wish something like this is done for Assam flood which occur every year.. instead of statue

[@NinjaFloodYoutuber]

Am I sponsered?

[@Bestoftherest222]

Look how much can be accomplished when a political party IS NOT in the way of building things people need and NOT in the way of building/expanding infrastructure. Take note USA.

[@Ano_ny]

am I the only one that is thinking about portal while watching this?

[@madness8897]

Welcome to the halls of moria

[@PoeCompany]

MORIA

[@orangemyk]

Wonder how much time and money it would take to build something like that in the USA with all the unionized slobs that pass for construction workers.

[@Kvasiir]

Or how many corrupt corporate scum would leach off the project.

[@strugglebuggietv]

thank the unions for the 40hr workweek, health insurance, overtime and sick-leave.

[@edwardbernayse6665]

something like that could've been done in the usa if it wasn't for trillions of dollars being pumped into our MID and unnecessary wars for imperialistic reasons.

[@Keepskatin]

Don't forget all the lazy,poor workmanship quality latin immigrants.

[@gennadiyvasylyev7543]

people can avoid tsunami if they enter into ball like soccer ball zorbung please watch ​@ people would enter zorb ball and zorb ball outer part is covered in hard rubber so ball does nt brak when hit sharp object and when tsunami hits zorb ball full of air rises to surface people cn exit zorb ball when at surface

[@T4l0nITA]

This is some Neon Genesis Evangelion engineering stuff

[@ragatamar.7944]

Yet, japan still has a ton of depth to IMF so good luck 💪💪💪

[@arjunraj823]

their godzilla is tsunamis, floods & earthquakes

[@richardbambenek2601]

Why do humans insist upon living in areas that are so challenging?

[@michaeldeierhoi4096]

That sounds like an interesting research project. Let us know how it turns out.

[@WWuxian]

maybe this kind of technology can survive "the great flood".,