The submarine is manned by the crew, and crew members are called submariners.
The 'helmsman' steers a submarine.
Fulton designed a submarine called Nautilus.
study submarine procedures and sleep
The USN's submarine force in WWII was called the SILENT SERVICE.
The H. L. Hunley was the name of the Confederate submarine that was the first combat submarine to sink an enemy ship.
submarine
A submarine earthquake causes a tsunami.
A submarine is kept at, or close to, surface air pressure.
Actually the submarine will not kill any one, but the rockets and torpedo launched from the submarine kill the people.
Nautilus
submarine
bridge