WEBVTT - How do the engines breathe in diesel submarines?

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<v Speaker 1>Welcome to Brainstuff from how stuff works dot com where

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<v Speaker 1>smart Happens. Hi Am Marshall Brain with today's question, how

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<v Speaker 1>do the engines breathe in a diesel submarine? A diesel

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<v Speaker 1>submarine is a very good example of a hybrid vehicle.

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<v Speaker 1>Most diesel subs have two or more diesel engines. The

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<v Speaker 1>diesels can run propellers, or they can run generators that

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<v Speaker 1>recharge a very large battery bank. They can also work

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<v Speaker 1>in combination, one engine driving a propeller and the other

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<v Speaker 1>driving a generator. The sub surface, or it must cruise

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<v Speaker 1>just below the surface using a snorkel to run those

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<v Speaker 1>diesel engines. Once the batteries are fully charged, the sub

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<v Speaker 1>can then head underwater. The batteries power electric motors that

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<v Speaker 1>drive the propellers. Battery operation is the only way a

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<v Speaker 1>diesel sub can actually submerge deep into the water. The

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<v Speaker 1>limits of battery technology severely constrained the amount of time

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<v Speaker 1>a diesel sub can stay underwater. This is the huge

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<v Speaker 1>benefit of using nuclear power in a sub. Nuclear generators

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<v Speaker 1>need no oxygen, so a nuclear sub can stand or

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<v Speaker 1>water for weeks at a time. For more on this

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<v Speaker 1>and thousands of other topics, is It how staff works

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