Submarine cables are only suitable for use under water, that is what they are made for.
A submarine is only used under water.
The submarine is under water.
Submarine.
Yes they can!
it is a under water earthquake
In war a submarine can hide under the water and attack without being seen.
A submarine is a sea-going vessel, both on the surface and under the water.
The vessel is a submarine.
A submarine.
A submarine.
no unless you are in a submarine.