Approx there are 300 operational warefare submaires owned by various contries. A mixture of Nuclear and diesel powerd subs
Who Knew - 2010 Submarines 4-3 was released on: USA: 24 May 2011
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.
During WW2 the US Navy built 126 submarines.
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52 US submarines were lost in WW2. This was about 1 in every 5 submarines that the US had in WW2
2,200,000 Soldiers 97 Warships 40 Submarines.
Shallow diving submarines are used for reef watching in many parts of the world.
Inside - 2007 Inside Cocaine Submarines 4-1 was released on: USA: 10 January 2010
Yes, many submarines were used in WW1 by most of the major combatants.