The SSI Extended Range (XR) Foundations provide you with an underwater workshop environment to improve your skills to an extremly high level using XR or Recreational Total Diving System.Completing the XR Foundations Course means that you demonstrated Good Buoyancy, Perfect Trim, Amazing Stability, Correct Propulsion and Teamwork in the equipment configuration used during the course. You can compare it to the SSI Perfect Buoyancy Course… But on Steroid!