A submarine will go back under, or completely submerge after coming to the surface.
- Submarines float on the surface thanks to air-filled ballast tanks. When the submarine is ready to submerge, valves at the top of the ballast tanks are opened. As the air departs, seawater collects at the tank's bottom. It makes the sub heavier, and it subsequently sinks.
- The submarine features ballast tanks (shown) that may be filled with water or air to alter its buoyancy. The ballast tanks are filled with air when the submarine is on the surface. As a result, the submarine has a lower density than water.
- The submarine relies on unique tanks that can be filled with water or air to control buoyancy. The tanks are filled with air in order to return to the surface. This causes the submarine to float to the surface because it is less dense than the surrounding water.
Thus this is the meaning of submarine.
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