Audible dot com is the leading provider of downloadable digital audio books and spoken word entertainment. Audible has over one hundred thousand titles to choose from to be downloaded to your iPod or MP three player. Go to audible podcast dot com slash brain stuff to get a free audio book download of your choice when you sign up today. Welcome to Brainstuff from how stuff works dot com where smart Happens. Hi Am Marshall Brain with today's question, how
do the engines breathe in a diesel submarine? A diesel submarine is a very good example of a hybrid vehicle. Most diesel subs have two or more diesel engines. The diesels can run propellers, or they can run generators that recharge a very large battery bank. They can also work in combination, one engine driving a propeller and the other driving a generator. The sub surface, or it must cruise just below the surface using a snorkel to run those
diesel engines. Once the batteries are fully charged, the sub can then head underwater. The batteries power electric motors that drive the propellers. Battery operation is the only way a diesel sub can actually submerge deep into the water. The limits of battery technology severely constrained the amount of time a diesel sub can stay underwater. This is the huge benefit of using nuclear power in a sub. Nuclear generators need no oxygen, so a nuclear sub can stand or
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