How do you ascend when scuba diving?

How Does A Buoyancy Control Device Work? (Don’t Dive Without Knowing)

How does a buoyancy control device work is by using air. Your buoyancy control device works using an air bladder. The more air that is added to this bladder, the more buoyant you will be. Conversely, as the air is released from the air bladder, the less buoyant you will be. Air is added via an air-inflation valve. Air is dumped via air-deflation valves.

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