Choose Your Poison - Part 1 - AIR

[@SouthernCrossSailing]

Thank you so much for making these videos. Your combined perspective as an expedition technical diver and anesthesiologist gives you a unique ability to articulate this better than anyone else.

[@beeka73]

Thanks Richard, this should be in every instructors “share” list with OW students!

[@adobahala]

Great video. I am thai newbie scuba diving for this kind of sport and will love to see more your video. 👍👍

[@harryclark2835]

Great video, looking forward to more in the series!!

[@norbertosalazarzagaglia6216]

G´DAY HARRY!!! great master class. Thanks a lot for this video and just runing to watch the par 2. A great honor to see you in Covanera- Pozo azul

[@DrHarryH]

Thanks Berto! Good to hear from you! Did you guys end up buying the Argolamps?

[@norbertosalazarzagaglia6216]

Hi Harry; I am not Berto; just crossed a word on August 23erd while helping to carry @@DrHarryH a couple of cylinders.Thanks for the answer any way

[@danflaherty1132]

First time to your channel, Harry, and admired the way your present a complex topic in easy-to-understand terms. Well done and I am on to the next video!

[@ubuntuscorpious]

Bloody great stuff. Looking forward to more content like this!

[@DrHarryH]

More to come!

[@bluechips2566]

Awesome and very informative video. Amazing. Thank you for sharing your knowledge!

[@matthewsavage3492]

Hi Harry, great to see there is going to be some regular content coming. Interested in a video on your thoughts regarding cut-off valves in CCR equipment which has been topical lately, either in manual add valves or in offboard connections. Do you use them and why? Hope you can get back across the ditch and into the Pearse soon.

[@paularbon1093]

Thanks Harry for another great video. You have a nice looking compressor set up there.

[@DrHarryH]

Cheers Paul!

[@ardentpyro2]

Richard thank you for these videos they are wonderful, you are an inspriation in diving and as a person. Please make more content :)

[@alexfinn7989]

really great video! Looking forward to Part 2!

[@mavenmavenpest1750]

Another great video - thanks.

[@DrHarryH]

Glad you enjoyed it

[@markusleitner3735]

Super video! I hope to get more content from you! I am on the beginning of my Kiss Classic Training under ISE, and like your MEG in double config a lot. After your dive talk Interview, I would really like to see more of your explorations!Keep it up. Best regards from Austria!

[@DrHarryH]

Thankyou Markus!

[@madrx2]

Loving the videos and the know how! Could listen to you all day. Saw you on television earlier today and was told the wife " hey there's Richard I know him!" She said " how do you know him?!?," I told her I followed you on KZbin, she proceeded to throw a pillow at me and tell me I'm an idiot. Lol

[@DrHarryH]

Ah she went to the same school of wife-ing as mine!

[@Chogogo717]

Great to review!

[@ratcookie123]

I really appreciate these videos, for someone who's searching for a life interest i for the first time found gaining knowledge very interesting and almost like i could see a future in this type of activitie

[@jaimieboy999]

Go for it mate 👌👌

[@scottinnes7376]

Superb!! Lots more please!!👍🏻👍🏻

[@ngobmx]

This was super helpful. Are you guys planning any deep cave dives for this year? It's fantastic to see the difference dives going on!

[@DrHarryH]

Quiet year I'm afraid :-(

[@ketanmhatre6709]

Sir , i had a doubt .. in a fish aquarium when we use a air pump does it directly dissolves oxygen in the water as it pumps air in the aquarium or it just agitates the water and the oxygen from atmosphere dissolves in the water from the surface .. ??

[@DrHarryH]

Both I guess!

[@ketanmhatre6709]

thank you Sir .. for your reply ..

[@bunsoybee]

would increasing respiratory rate during safety stop be beneficial with respect to off gassing excess nitrogen?

[@DrHarryH]

Hi it's a good thought but not really. Respiration is not the limiting factor in clearing the inert gas from your body. It depends more on liberating it from the tissues and getting it back to the lungs. That's why gentle exercise during decompression stops may improve the efficiency of deco. Emphasis on gentle because excessive exercise increases bubbling!

[@cmpe43]

In a close loop, do you need to add gas at the extreme depths you hang out at and does your system automatically bleed the extra gas if you add?

[@DrHarryH]

Yes and yes! As you descend the loop gets squashed so more gas must be added. On the way up, the reverse occurs. The main gas being added to deal with the pressure change is called the 'diluent'.

[@johannmattis4842]

So it arises that there is an absolute limit of diving with lungs and gases which is around 300m? What about hydrogen then?

[@wezzuh2482]

Exactly why hydrogen may be employed. The deepest dive record was to 534 meters and it employed 1% O2 and 99% hydrogen for this reason. At that point, even using Hydrogen pushes the envelope on density.

[@reyneva]

[@sindred3530]

Is only Oxygen, Nitrogen, Helium & Hydrogen used for deep diving? Why aren´t Neon or Argon used for example to reduce narcosis?

[@DrHarryH]

In reality only O2, N2 and helium are used. Hydrogen is an experimental diving gas with many practical and theoretical concerns. Argon is used in drysuit inflation as it has good thermal properties, but it is highly narcotic and also very dense so no good for deep diving. Other exotic gases like xenon are so narcotic they can be used as anaesthetics!

[@sindred3530]

@@DrHarryH Thanks! :)

[@sawyerdave1]

Sir…when’s the exam 😅