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Speaker 1: Welcome to brain stuff These podcast. Hi Martiall brain A

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Speaker 1: submarine is a big, sealed tube that contains lots of

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Speaker 1: people and a limited air supply. Three things have to

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Speaker 1: happen to keep the air breathable. First, oxygen has to

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Speaker 1: be replenished as it's consumed. People suffocate if the percentage

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Speaker 1: of oxygen in the air falls too low. Second, carbon

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Speaker 1: dioxide must be removed from the air. Third, the moisture

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Speaker 1: that we exhale in our breath must be removed. Most

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Speaker 1: of the oxygen comes from an oxygen generator, which creates

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Speaker 1: oxygen from the electrolysis of water. In an emergency, oxygen

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Speaker 1: can also come from pressurized tanks or some sort of

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Speaker 1: oxygen canister. Carbon dioxide can be removed from the air

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Speaker 1: chemically using soda line. The carbon dioxide is trapped in

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Speaker 1: the soda line by a chemical reaction. The moisture can

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Speaker 1: be removed by a d human to fire. This prevents

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Speaker 1: it from condensing inside the ship. For more on this

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Speaker 1: and thousands of other topics, go to how stuff works

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Speaker 1: dot com. M