The submarine referenced is the USS Bowfin (SS-287) but stock footage and sets were used in the film. The Navy did not allow filming onboard submarines until the end of the Cold War, and even then it's strictly regulated for security reasons. Even submarine crewmembers require permission from the CO to have a camera aboard ship.
plunger is a fitting name for submarine because , it is under the water
another name for a submarine is submarinous. it is latin meaning "steel fish" or "under water tank"
the U boat 'is' the German word for submarine. western nations just used submarine. U boat is short for Unterwasserboot, which translates as undersea boat or under water boat or submarine.
Periscope.
the name of a boat that goes underwater is called a SUBMARINE.
Below
A submarine is an undersea boat, or submersible.
The Nautilus was Fulton's submarine.
USS Triton (SSRN/SSN 586)
this word is an adjective meaning "under the sea". submarine is the word shortened from the term "submarine boat".
The H. L. Hunley was the name of the Confederate submarine that was the first combat submarine to sink an enemy ship.
The Confederate submarine 'H L Hunley' was the first submarine to sink an enemy ship