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North Korea ramps up preparations for war with US (www.newsweek.com)

submitted 10 months ago by throws_lemy@lemmy.nz to c/news

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[–] Siddhartha-Aurelius@kbin.social 15 points 10 months ago (1 children)

There are ways of creating oxygen onboard submarines. The only real limits to time submerged is the amount of food the boat can carry.

Here is a video by Destin from the Smarter Every Day youtube channel explaining oxygen generation onboard submarines. https://youtu.be/g3Ud6mHdhlQ

[–] acockworkorange@mander.xyz 5 points 10 months ago (1 children)

I think it downplayed the importance of CO2 scrubbing, because we can tolerate low O2 a lot easier than high CO2. High CO2 is also what gives us that suffocating feeling.

It briefly touches on rebreathers near the end. The theory behind them is that the difference between the %O2 on the inhale and exhale of our breathing cycle is very little. So if you can get rid of the CO2, you can re-breathe that same air for a "long" time before it starts to get too low in O2 content and it starts to impact your survivability.

[–] intensely_human@lemm.ee 1 points 10 months ago (1 children)

High CO2 may be what leads to that suffocating feeling, but low O2 is what makes us literally die

[–] acockworkorange@mander.xyz 1 points 10 months ago

CO2 is literally toxic. As in, if you're stuck in a hermetically sealed chamber, you'll suffocate to death due to CO2 toxicity, not lack of O2.