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Recreational Rebreather Certification


Try it - You will love it! Rebreather diving is easy, fun and exciting

Poseidon Seven Rebreather Poseidon Logo Poseidon Rebreather How it Works

What is a rebreather?
Rebreathers are essentially a gas recycling machine. A rebreather gathers a diver's exhaled air; removes the CO2; adds oxygen; and allows you to breath it again! This means the air stays within the system, rather than being exhaled out as in a scuba system. By "re-breathing" your gas, you are now in a silent, bubble-free environment where you can stay on your dive for a much longer period of time and wildlife will get closer to you than ever before. You will be highly efficient, with reduced gas consumption and your dives will be more enjoyable.

Denver Divers invites you to discover the new POSEIDON SE7EN recreational rebreather. Designed, built and tested to perform in all conditions, the POSEIDON SE7EN is the next generation of rebreather. Safety, performance, ease of use and desirability are combined to enable divers of all abilities to experience the underwater world without compromise. Whether you want to get closer to marine life, spend much more time underwater, dive deeper or simply enjoy the bubble-free silence, the POSEIDON SE7EN is the smartest, fastest, safest way to dive.

Tuition: $850 (Includes consumables and pool equipment rental)

SSI Online Academic Materials: $120


  • 40 hours class and pool**
  • 480 minutes of run time over at least 6 certification dives**
    **Depends upon student's grasp of concepts & buoyancy control on closed circuit system

Student to Teacher Ratio: 2:1


  • Open Water Diver Certification
  • 24 Logged Open Water Dives
  • Deep Diver Certification
  • Enriched Air Nitrox Certification (to at least 40% EAN)
  • Minimum age 18 years old
  • Physician's Release to dive regardless of medical question answers (must have a medical signed by a doctor prior to starting any training)

Required Documents:

Required Videos:

Tuition Includes:

  • Pool sessions
  • Academic review & hands-on training sessions
  • Use of three scrubber canisters during training
  • Gases (O2 and diluent)
  • Use of three required gas cylinders
  • Use of bail-out bottle and regulator system

Does NOT Include:

  • Rental OR purchase of Mark VII rebreather unit
  • Personal travel costs for open water dives

Denver Divers has made the financial and technical commitment to the POSEIDON SE7EN rebreather. All our rebreather instruction, therefore, targets the Poseidon product. The POSEIDON SE7EN was developed from the world's first recreational rebreather - the Mark XVI. This second generation machine boasts:

  • New internal hardware (upgraded from the Mark XVI)
  • Bluetooth connectivity that allows automatic dive log downloads
  • Detachable displays and sensors
  • Adaptable software that allows you to upgrade the recreational rebreather (to 130-foot maximum depth) to a technical rebreather (to 330-foot maximum depth)
  • An upgraded mouthpiece that keeps the bail-out valve locked in place in closed or open circuit, while still enabling simple switches from closed to open circuit
  • A protective, desirable and functional cover with a built-in handle and trim weight system, along with grab and lighting rails
  • Local service and repair support at Denver Divers

We selected the POSEIDON SE7EN because it is broadly supported throughout the world including a number of liveaboard companies, it is easy to transport, it has been extensively tested and is in its second generation of development, and because it is supported by our primary certification agencies - SSI and TDI.

As a certified open water diver, you can enter the exciting world of rebreather diving without having to dramatically change your existing diving philosophy. The SSI rebreather program simply enhances and builds upon your existing knowledge

Throughout the program you will advance your knowledge and understanding of principles, procedures and theories specific to diving safely with a rebreather. You will be introduced to new equipment concepts and become one with you new found dive buddy “Your rebreather”. You will also learn and master new skills designed to enhance your safety and enjoyment using this new equipment. During your program your instructor will cover everything from supreme buoyancy, propulsion and equipment management.

How do I become a Poseidon Se7en Rebreather Diver? Call us (303-399-2877) and one of our rebreather instructors will gladly explain and provide you with detailed information.