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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.
It starts with your buoyancy control device (BCD). A BCD does exactly what its name describes â it gives you control in the water. Sometimes you want to float on the surface comfortably. Occasionally, you want to kneel or stand on the bottom, sometimes during a training course.