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A submarine is
vessel that can be used underwater; it was especially effective during war for
discharging torpedoes. They were made so that countries could attack each other
without being seen.

There are 4 main categories of submarines

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1) The nuclear submarine is a submarine
that is powered by a nuclear reactor. It has an incredible range, which makes
it ideal for exploring.

2) Pleasure submarines are generally used by people to view and experience marine
life. These submarines are quite small and the rides are generally quite
expensive.

3) Submarines that are used to go down to the deepest point in the sea are
generally for research purposes, which is why we have special research
submarines that scientists use to study the marine life.

4) Military submarines are used for military purposes like war and are used to
hold nuclear weapons etc.

Submarines during World War 1 made a very significant impact. Some forces such
as the U-boats of Germany were seen in action for the first time. Submarines
made it easier for Germany to attack from under water, which is how they sunk
three American merchant vessels.

During World War 2 the submarines comprised of less than 2 percent of the US
navy but sank more than 30 percent of japans navy including aircraft.

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