SSI SCR Extended Range eLearning

SSI SCR Extended Range — eLearning & Certification Credit Only

Take your semi-closed rebreather diving to the next level with the SSI SCR Extended Range programme. This advanced course teaches you how to safely plan and conduct decompression dives using a semi-closed rebreather system to depths of up to 40 metres (130 feet). This product provides your academic training and certification credit only; all practical training dives must be booked separately with an authorised SSI Extended Range Instructor.

What you’ll learn online

• SCR diving theory and advanced gas management concepts
• Equipment setup, calibration, and maintenance procedures
• Decompression planning and gas-switching with multiple nitrox mixes
• Emergency and bailout strategies for semi-closed systems
• Environmental and physiological considerations for deeper SCR dives
• Team awareness, dive planning, and problem management protocols
• Post-dive analysis and scrubber life management

Required practical training (booked separately)

To complete your certification, you’ll need to participate in in-water training dives with an authorised SSI Extended Range Instructor. These sessions are designed to reinforce your theoretical learning through practical, real-world application and typically include:

• Progressive semi-closed rebreather dives using enriched air nitrox
• Decompression procedures and ascent management up to 40 metres
• Simulated equipment malfunctions and bailout ascent drills
• Gas-switching, buoyancy control, and scrubber monitoring exercises
• Team protocols, communication, and emergency coordination underwater

The practical training is not included with this eLearning product and must be arranged separately with Dorset Diving or another SSI Extended Range Dive Centre that offers SCR Extended Range training.

Important prerequisites

• You must be at least 18 years old and certified as an SSI SCR Diving (or equivalent) diver.
• A minimum of 50 logged dives, including experience with SCR or CCR systems, is required before starting practical training.
• A current diving medical (within 12 months) and valid first aid, CPR, and oxygen administration certifications are mandatory.
• Divers must use an approved SCR unit (such as the Mares Horizon) configured to SSI Extended Range standards.
• Always confirm that the dive centre you plan to use offers SSI SCR Extended Range training and has access to appropriate dive environments.

Free registration

To begin your studies, register a free SSI account and affiliate with our dive centre here:
Register with Dorset Diving.

What’s next?

After completing the SCR Extended Range programme, divers can continue on to CCR Extended Range, Technical Extended Range, or Trimix Diving to further expand their technical diving capabilities and depth limits.