The submarine is manned by the crew, and crew members are called submariners.
The 'helmsman' steers a submarine.
A torpedo is like an underwater missile about the size of a man. They are shot by submarine or placed and will exploded when touched. The Nazi used 2 to sink a ship called the Lusitania.
Fulton designed a submarine called Nautilus.
Submarine mountains that were once active volcanoes are called seamounts.
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.
bridge
Periscope.
Nautilus