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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.
We float with a buoyancy control device (BCD) and sink with lead weights. The BCD only works when there is air in your tank, or you are at the surface of the water and able to manually inflate it. 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.