USA has the most nuclear submarines
Argentina had diesel-electric submarines while the British had nuclear-powered submarines.
Most submarines have propellers that spin, pushing them forward. A few smaller research submarines use a water jet for propulsion.
Nuclear energy is used to power most modern submarines
most do
Yes, many submarines were used in WW1 by most of the major combatants.
Most submarines have at least two crew hatches which are exit routes.
No - most modern submarines, depending on type, have between 15 and 25 torpedoes aboard.
Most submarines were made of steel.
Most submarines now have a single nuclear reactor. Some smaller, coastal submarines have a single diesel.
There are different answers to that but the most common one is that the USN had 288 submarines in WW2
There are no known submarines named Juliet. However, the name Juliet is used by NATO to identify a class of Soviet submarines that are no longer in operation. It was a diesel-electric submarine capable of launching cruise missiles. Most American World War II submarines were named after species of fish. Most early nuclear-powered submarines were named after World War II submarines. The first generation of nuclear-powered ballistic submarines were named after famous Americans. Most Los Ageles-class fast attack submarines are named after U.S. cities, with the exception of the USS Hyman G. Rickover. Most Ohio-class guided missle and ballistic missile submarines are named after U.S. states, with the USS Henry M. Jackson being the exception. The Virginia-class fast attack submarines are mostly named after U.S. states. The lone exception as of January 2011 is the John Warner, which is expected to be delivered in 2015.