How a submarine works is that it has a thin, long shaped body so it can move lightly and swiftly in the ocean. How a submarine goes up and down in the water by using a Ballast Tank. The Ballast Tanks are made of air so its density is less than the water surrounding it. How the Ballast Tanks work so you can move is that the Ballast Tanks then fill up with water making the entire amount of density of the ship higher than the the surrounding water.
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