Semi-Closed Rebreather (SCR) Diving

Dive into the world of rebreathers with this entry-level semi-closed rebreather (SCR) course. Learn how to independently plan and conduct no-decompression dives to a maximum depth of 30 meters / 100 feet using the Mares Horizon rebreather.

Start your SSI Extended Range rebreather adventures with SSI today!

What Will You Learn?

Join the exciting world of rebreather diving! Learn to go non-decompression diving up to 30 meters depth with the SSI SCR Diving course. This Extended Range course provides a thorough introduction to SCR technology, the details of assembly, pre-dive checks, dive planning, and dealing with potential failures.

Become a well-prepared, capable, and autonomous SCR diver with SSI today!


What Will You Do?

  • Complete all academic sessions and assessments as outlined in the unit-specific instructor manual for SCR Extended Range.
  • Complete the program’s final exam.
  • Complete an equipment configuration session as outlined in the instructor manual for SCR Extended Range.
  • Complete the XR Water Fitness Evaluation as outlined in the SSI Training Standards.
  • Complete at least one (1) pool/confined water skill development session with a minimum cumulative time of at least one (1) hour as outlined in the instructor manual for SCR Extended Range.
  • Complete at least four (4) open water training dives as outlined in the instructor manual for SCR Extended Range.
  • Complete at least 300 minutes of in-water runtime on the applicable SCR unit.

Course Schedule

Recommended hours for completion: 24-30. The number of classes, hours and sessions per day are set by the individual instructor, based on student needs, student ability and water conditions.

Course Price

Get in touch with an SSI Training Center for the same.

Course Prerequisites

Have logged at least:

  • 24 total dives

Have the following SSI certifications or an equivalent from a recognized training agency:

  • Enriched Air Nitrox 40
  • Deep Diving

Equipment Requirements

SCR Total Diving System

  • A semi-closed rebreather that has CE-type and SSI approval

A single bottom gas cylinder (minimum volume: 5.7 liters) and bailout regulator with:

  • Second stage with 1- to 2-meter hose and SPG
  • Low-pressure inflator hose or quick-connect compatible with the unit
  • Oxygen cleaned as required


  • Mask
  • Fins
  • Exposure suit appropriate for the environment
  • A backup buoyancy device: dry suit or lift bag
  • A cutting device
  • One signaling device for deploying from depth (red surface marker buoy is recommended, but follow local guidelines)
  • A reel or spool (appropriate for the maximum planned depth) One surface signaling device (whistle or similar)
  • Logbook
  • Manufacturer and/or SSI Pre-Dive Checklist

*Equipment will be provided by your Dive Centre. We recommend that you should get your own gear once you become a certified diver.

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