A submarine stays underwater primarily due to its ability to control buoyancy through ballast tanks that can be filled with water or air. By adjusting the amount of water in these tanks, the submarine can achieve neutral buoyancy, allowing it to sink, float, or remain at a desired depth. Additionally, submarines are designed to withstand the pressure of deep water, enabling them to operate effectively below the surface. This capability allows them to conduct stealth operations and avoid detection.
Submarine cables are only suitable for use under water, that is what they are made for.
Without breathing, the world record is 22min With air bottles (scuba diver) or in a submarine you can of course stay longer. In a submarine when you have enough supplies, you can stay virtually forever under water.
A submarine is only used under water.
The submarine is under water.
For modern nuclear subs, they could theoretically stay under indefinitely. Of course, there's a crew which has to eat and bathe, and food and toiletries do eventually run out.
The vessel is a submarine.
Submarine.
it is a under water earthquake
Yes they can!
In war a submarine can hide under the water and attack without being seen.
A submarine is a vessel that can travel both on the surface and under the water.
A submarine is a sea-going vessel, both on the surface and under the water.