Being, acting, or growing, under water in the sea; as, submarine navigators; submarine plants.

A submarine boat; a ship that can travel under the surface of the water. Most such ships are ships of war, as part of a navy, but submarines are also used for oceanic research. Also called sub and (from the German U-Boot) U-boat.

a submarine torpedo boat; -- called specif. submergible submarine when capable of operating at various depths and of traveling considerable distances under water, and submersible submarine when capable of being only partly submerged, i.e., so that the conning tower, etc., is still above water. The latter type and most of the former type are submerged as desired by regulating the amount of water admitted to the ballast tanks and sink on an even keel; some of the former type effect submersion while under way by means of horizontal rudders, in some cases also with admission of water to the ballast tanks.

A stowaway on a seagoing vessel.

A vessel capable of travelling under water. Also meaning underwater.

a submersible warship usually armed with torpedoes

beneath the surface of the sea

a cigar shaped, water tight, underwater vehicle for war or research uses

a labyrinth of tubes and pipes, so pinpointing the leak while at sea would have been impossible

a most unique sort of vessel

a necessary piece of our arsenal as it has expanded its mission since the end of the Cold War, providing essential peacetime and war fighting capabilities for our national security," U

a one compartment ship, flood any compartment and it sinks

a power ful moving machine that travel s through deep water s

a powerful moving machine that travels through deep waters

a self-propelled vessel capable of operating underwater

a ship capable of operating underwater

a ship that operates under water

a specialized boat that travels under water, usually for military or scientific purposes

a very complicated machine and the components vary from the large diesel engines to the delicate watch-like gears in the torpedo data computer

a vessel capable of operating completely underwater

a vessel capable of travelling both on and below the surface of the sea

a vessel designed for underwater operations that can still sail on the water's surface

a vessel designed to help us overcome those limitations and allow us to descend beneath the waves

a vessel that can travel underwater and carry people

Designed to travel mainly underwater. see gallery

heavy walled vessel that can withstand pressures under water and allow occupants to breathe air at sea level pressure and travels under its own power.

Pertaining to regions below sea level.

A submarine is a specialized watercraft that can operate underwater at very high pressures beyond the range of unaided human survivability. Submarines, first widely used in World War I, are used by all major navies today, especially the American, Russian and British navies. Civilian submarines and submersibles are used for marine and freshwater science and for work at depths too great for human divers.