Poseidon Se7en CCR Training

Poseidon Se7en

The Poseidon Mark Se7en CCR (Closed-Circuit Rebreather) is truly the world’s first CCR for recreational diving. It is designed, built and tested to perform well in all conditions. It’s a fully closed, fully-automated unit that will make you see diving in a different light. Performance and ease of use offer divers the opportunity to experience the underwater world without compromise.

Whether your desire is to get closer to marine life, spend more time underwater, dive deeper or simply enjoy the bubble-free silence, the Poseidon Mark Se7en is for you. Together, the on-board computer and Smart Battery monitor and log both your oxygen exposure and decompression obligation.


The Poseidon Mark Se7en can be whatever you want it to be – a Recreational Rebreather or a 100-meter-rated Technical Rebreather; it’s your choice! With time and training, the ocean floor can be your limit.

Diving the Poseidon Se7en


In the Gulf of Mexico on the Poseidon Se7en, we had relaxing yet exciting experiences with marine life that otherwise would have run scared from bubble blowers. Without blowing bubbles, we co-existed with the largest sea turtle on earth (shell the size of a car’s hood with barnacles the size of tangerines) and scratched the heads of three different octopi.

Then, while hanging in silence on the down line at the Oriskany watching the activity of humans and fish below, the peace and underwater connectedness was awe-inspiring. Words cannot begin to describe the experience. We look forward to introducing you to a new way of diving.



This course has the following prerequisites:

  • Be at least 18 years old.
  • Possess a minimum of Open Water Diver certification.
  • Obtain a physician’s approval for diving.



Certification to dive the Mark Se7en is easier than you might think. The typical course for those already certified as open water divers requires about 24 hours of academics and pool time with at least six assemblies and disassemblies. You then need six open water dives with a combined run time of over 300 minutes to complete the certification.

Your first three dives are to less than 40 feet with the next three dives to less than 60 feet. If your goal is to dive deeper than 60 feet, take the Deep Diver CCR Course and log more time underwater.



All classroom and confined-water training takes place right here at Harry’s Dive Shop. We are among the few dive centers in the country with our own indoor, heated swimming pool. This 16-foot-deep pool was designed specifically for diver training. It provides unbeatable convenience and enjoyment.



Classroom and pool training for the Poseidon Se7en typically takes place on a Friday, Saturday and Sunday, These are day-long affairs and you get in the water every day. The training is highly individualized, and scheduled on an “as needed” basis. The first step in the process, however, is to take part in one of our regularly scheduled Try CCR Experiences.

Please be aware that, while we make every effort to keep our listings accurate and up to date, you should always call the store to confirm starting dates and times.

How Much?

How Much?

The cost of this program is:

  • $599 with rebreather purchase.
  • $999 without rebreather purchase.

Students are responsible for supplying:

  • CO2 absorbent.
  • Gas fills.
  • Open-water training expenses.

Your instructor will have details and costs for the optional open-water training dives.

Required Equipment


Students are responsible for supplying the following:

  • Mask, snorkel, fins.
  • Weight system, weights and exposure protection as needed.

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