The proper term is "Underway Submerged"
The proper term is "Underway Submerged".
Submarine.
The submarine is manned by the crew, and crew members are called submariners.
The 'helmsman' steers a submarine.
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.
Their is an air chamber in most fishes just like in submarines. When it gets filled with air the fish moves up. While, when air is released the fish moves down. This is precisely what happens in a submarine.
submarine
A submarine earthquake causes a tsunami.
Nautilus