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The vessel is a submarine.
Its a pressure vessel like a submarine but without any engines used to explore the depths of the oceans. Its life support is supplied by a surface vessel that pumps air to the bathysphere and supplies it with electricity and communications.
A submarine is a sea-going vessel, both on the surface and under the water.
submarine
The process of a submarine to move from the surface of the ocean to a position underneath the surface is called a dive. This is accomplished by allowing water to fill the tanks of the submarine, the heavy water pressure now inside the vessel now will force it to sink below the surface, thus a "dive".
A vessel that travels underwater is termed a submarine.
Submarine.
An airlock is a device which permits the passage of people and objects between a pressure vessel and its surroundings while minimizing the change of pressure in the vessel and loss of air from it.
submarine
Certified Pressure Vessel
A submarine is a vessel that can travel both on the surface and under the water.
A submarine is kept at, or close to, surface air pressure.