It depends on the submarine type (Fast-Attack, Missile, etc.), but the general crew complement is between 90-120. That figure increases to around 150-160 during long deployments, or during sea trials/certifications, when there are also civilian riders aboard.
No.
Yes definitely. Maybe not military class submarines but there are many public submarine tours that take you under the water to see shipwrecks, sea life etc
They work off the same principle of magnets.
Submariners.
submarines are important because people need to go under the sea and do what they got to do to save the world
During WW2 the US Navy built 126 submarines.
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15
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Modern nuclear submarines can work (or patrol) for 3 months or more.
52 US submarines were lost in WW2. This was about 1 in every 5 submarines that the US had in WW2