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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.
What is an implantable cardioverter defibrillator (ICD)? An implantable cardioverter defibrillator (ICD) is a small, electronic device that continuously monitors the electrical activity of the heart. It is about the size of a stop watch and is usually inserted under the skin in the upper chest.