: How do those floaty balloon things work that divers use to quickly ascend?

Question

: How do those floaty balloon things work that divers use to quickly ascend?

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Answer 1

Those floaty balloon things are called “buoyancy compensators,” or BCs for short.
BCs have air tanks that are filled with a special gas called “compressed air.” When a diver wants to float to the surface, they can press a button on their BC to release some of the air from the tank. The air then rises to the surface, pulling the diver up with it. When the diver wants to go back down, they can simply let some of the air out of their BC or add more air to it to make themselves more heavy.