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.
The subclavian artery is the vessel that travels under the clavicle and supplies blood to the arm.
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 Penguin.
a submarine