The fastest way is to use compressed air to blow water out of the ballast tanks. This makes the submarine buoyant and it raises to the surface. The faster it is done the faster the sub will go up.
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.
A submarine can operate under water while other ships cannot, and a submarine can surface after going under water, while other ships can't.If everything is working correctly, a submarine can surface after sinking, while other ships cannot.
Periscope
Landmines are positioned under earth and leaves. A mine for a submarine hangs in the water below the water surface, or is ejected from a ship's deck to float down to the depth of 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.
Submarines dive by opening vent valves that allow sea water to push air out of their ballast tanks.
The submarine is under water.
As of 2014, a submarine can travel between 49 and 52 miles per hour. The exact speed depends on the make of the sub and whether it is traveling on the surface or under water.
Submarine volcanoes act the same way on top of the surface of the earth as under the water. The only difference is that, unlike on top of the ocean, it explodes UNDERNEATH the water. Yes, that is the answer to your unexplainable question.
The vessel is a submarine.