Yes. Actually, the first submarines were used a number of years before 1912.
Germany made its own submarines and had been doing that since the days of WW 1, long before Hitler.
There are different answers to that but the most common one is that the USN had 288 submarines in WW2
David Bushnell invented the first war submarine
Bigger, Deadlier, Faster, more Comfortable.1. Bigger, Faster, Deadlier, more Comfortable.
The U.S. had 111 submarines in commission at the start of World War II and commissioned 203 more before the war ended.
Yes, before cruise missiles came about, submarines were armed solely with torpedoes and, more common in WW2, deck guns.
About 2,100 by many different countries.
Plane, train, cars, buses, ships and submarines
As of end of 2010, the Russian Navy included 12 strategic submarines of four different types. The submarines can carry 160 sea-launched ballistic missiles (SLBMs) that can carry 576 nuclear warheads.
Bigger, Deadlier, Faster, more Comfortable.
they can be in different sizes such as being long or short or huge and small