No.
Yes, they does.
They rise to the surface when air is pumped IN. They sink when air is let out
They use ballast tanks to contain sea water or air to control their depth
Submariners.
Submarines change their depth by use of ballast tanks. To dive, they open their tanks so that they become filled with water. They also angle their dive planes. To surface, they pump the water out of their tanks and fill them with pressurised air.
submarines are important because people need to go under the sea and do what they got to do to save the world
Submarines stay afloat by using a combination of buoyancy and ballast control. When they want to surface, they use compressed air to force water out of ballast tanks, making the submarine lighter and allowing it to float. To dive, submarines take in water into these tanks, increasing their weight and causing them to sink. By adjusting the amount of water in the ballast tanks, submarines can maintain their desired depth in the water.
Submarines are designed with enough ballast and control systems to allow them to submerge and surface as needed.Surface ships are designed only with enough ballast and control systems to keep them on the surface. While they can sink just as well as submarines can, their ability to re-surface without a salvage operation is non-existent.
Submariners.
Yes, they had crews.
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Upthrust, also known as buoyant force, is applied in various real-life scenarios such as designing ships and submarines to ensure they float and control their buoyancy. It is also important in swimming and diving as it helps objects and people to float or sink in water. Additionally, upthrust is utilized in hot air balloons to help them fly by providing lift.