If you are unsure how to weight yourself in order to achieve optimum buoyancy underwater and on the surface, do not dive with your XS Scuba BC until you have obtained the necessary instruction from your diving instructor or Authorized XS Scuba Dealer. Failure to weight yourself properly can create a hazardous condition that could lead to serious injury or death. IT IS VERY IMPORTANT TO READ ALL INSTRUCTIONS AND WARNINGS PRIOR TO USING YOUR XS SCUBA BOUYANCY COMPENSATOR. Definitions of Warnings,