How the submarine dives and floats to the surface

Submarines can dive deep into the sea or float up by pumping water or air into the internal compartments to change its weight.

According to We are the mighty, ships can float on the water because of the weight of water it occupies the weight of the ship. Gravity pulls the ship down, but the water forces Archimedes upwards in the opposite direction, helping the ship not sink.

Submarines float or dive into the water thanks to ballast tanks.(Photo: Tumblr).

Submarines use ballast tanks filled with air or water to dive and float. When submarines float on water, ballast tanks filled with air make the density of ships smaller than the surrounding water. If the ballast tanks are filled with water, the density of the vessel is larger than the water so it sinks.

Some submarines use two different shells to replace the function of ballast tanks. This design allows to submerge the outer shell with water, causing the ship to sink. The living and working place of the crew in the inner class.

According to Foxtrot Alpha, the example of double hull design is Russia's Alfa class submarine. They were created in the 1960s, have the fastest speed compared to the same submarines to this day.