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When diving doubles you will need to use your wing/BCD to compensation. Typically you can't control your buoyancy only with a drysuit with steel doubles and stage bottles so you will need to use your wing to offset buoyancy.
The BCD is connected to the air tank by this device: BCDs usually have a thingy that looks like this: By pushing one button, some air from the scuba tank is put into the BCD. By pushing another, the BCD leaks out of the BCD. You are not supposed to use the BCD as an elevator, but instead to control your buoyancy.