this word is an adjective meaning "under the sea". submarine is the word shortened from the term "submarine boat".
A submarine is an undersea boat, or submersible.
The Nautilus was Fulton's submarine.
Below
plunger is a fitting name for submarine because , it is under the water
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
Submersible.
Nautilus.
Underseaboat.
A submarine
a Dutchmen named Hans Lippershey who invented the submarine in 1608.
Alvin was the special submarine that fount The Titanic remains