A vessel that travels underwater is termed a submarine.
It sounds like you are referring to a torpedo.
A submarine is a ship that can travel underwater.
as a dilldo
Autonomous Underwater Vehicles. It is rabot which travels underwater.
Submarine
submarine
In general we call it a blood vessel. Those which carry blood away from the heart are arteries, those which take it back are veins, and the tiny, thin-walled tubes which are found in the organs and exchange substances with the cells are capillaries.
Because xylem is a vessel that water travels through.
A submarine is a vessel that can travel both on the surface and under the water.
The correct spelling is submarine (underwater, or a submersible vessel).
a submarine
A Penguin.