Submarines will implode very well if they go to a depth past their rated crush depth.
All boats are designed to withstand a lot of PSI on the hull, and most boats are designed so that the hull contracts and expands with depth changes. This ability to flex increases the longevity of the hull, though not all navies build their boats that way.
In addition to hull design (usually spherical or cigar shaped, the best design for pressure), boats maintain a positive air pressure inside while submerged. This is less about pressure on the hull than it is to maintain a vigil on hull integrity; if pressure in the boat drops, it means there's a leak or flooding somewhere, or a hatch not sealed properly.
When a submarine goes farther down in the water, the water pressure becomes greater. If the submarine goes to far, pipes can explode and let in water, or it can implode the submarine
Submarine cables are only suitable for use under water, that is what they are made for.
A submarine is only used under water.
Excessive water pressure at depth would implode the Sub destroying it and all soles within.
Only if they sink beyond their stress limit (crush depth). Subs are built to withstand the pressures very deep and will not "implode" unless they sink in very deep water. Don't forget; It is very rare for a submarine to sink with its pressure hull intact. Why would it sink when it is not taking on water? When it is taking on water and sinking, the water will enter the submarine at enormous pressures so the submarine will be flooded before it implodes. If, during the sinking, a compartment was sealed off from the compartment that is flooding it could implode but normally something else will give way (a hatch or a pipe) and so that compartment will also be flooded.
The submarine is under water.
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.