Semi Closed Rebreather Dräger Ray

This course is designed to introduce divers to the Dräger Ray semiclosed rebreather and develop the knowledge, skills and techniques necessary to use this type of rebreather. The course reviews the planning, organization, procedures, potential problems and hazards associated with semiclosed rebreather diving. It specifically focuses on the features, accessories, maintenance and proper use of the Ray semiclosed rebreather.



This course include the following:

  1. Demonstrate the GGG (Gas, Gauge, Gag) step prior to entering the water.
  2. Demonstrate the assembled unit one way valve check.
  3. Set the exhalation bag overpressure valve (exhaust valve) for the desired gas volume in the unit.
  4. Establish proper weighting using the Ray semiclosed rebreather.
  5. Perform an underwater bubble check for a buddy.
  6. Switch to the bailout system while underwater without flooding the breathing loop.
  7. Switch from the bailout system to the Ray without introducing water into the breathing loop.
  8. Perform a bag purge.
  9. Demonstrate proper buoyancy control while swimming underwater.
  10. Reduce counterlung volume underwater by exhaling through the nose.

To qualify for the Semiclosed Rebreather Course — Ray, an individual must:

  1. Be certified as a PADI Advanced Open Water Diver or have a qualifying certification from another training organization (for this program, a qualifying certification is proof of certification beyond entry level with experience in deep diving and underwater navigation) or as a PADI Open Water Diver (or qualifying certification) with proof of at least 10 dives logged beyond training dives for Open Water Diver certification.
  2. Be certified as a PADI Enriched Air Diver or have a qualifying certification from another training organization (this is defined as proof of enriched air certification that qualifies the diver to use any blend up to 40 percent oxygen.)
  3. Be at least 15 years old.
  4. Submit, to the instructor, medical clearance for diving signed by a physician, attesting to fitness to dive. The medical clearance must be current within the previous 12 months. The physician signing the form cannot be the individual.
  5. Sign the Certified Diver Experience Programs Liability Release
  6. Assumption of Risk form.