Why Do Submarines Float and Sink?

Answer

Submarines float and sink because they have ballast containers which are filled partly with water as well as with air. Water is driven into the tanks to raise density and allow the submarine to sink and it is also pumped out to reduce density and hence allow the submarine to float.
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The first motorized submarine was built by John Holland, and it became the U.S. Navy's first commissioned sub in 1900. Dubbed the USS Holland, it had two motors: a gasoline engine
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