GUE’s Rebreather Diver course is designed to educate individuals in basic rebreather technologies and to cultivate diver proficiency in the use of GUE approved rebreather configurations.


Applicants for a Rebreather course must:

Submit a completed registration form, a medical history, and a liability release to GUE Headquarters.
Be physically and mentally fit.
Hold insurance that will cover diving emergencies such as hyperbaric treatment, e.g. DAN Master-level insurance or equivalent.
Be a nonsmoker.
Obtain a physician’s prior written authorization for the use of prescription drugs, except for birth control, or for any prior medical condition that may pose a risk while diving.
Be a minimum of 21 years of age.
Be a GUE Tech 2 certified diver.
Have a minimum of 25 Tech 2 level dives beyond Tech 2 certification.
  • Course Content

    The Rebreather course is normally conducted over five days; it requires at least eight dives and a minimum 40 hours of instruction, encompassing classroom, land drills and in-water work.

    Rebreather Specific Training Standards

    • Student-to-instructor ratio is not to exceed 6:1 during land drill or surface exercises; ratios cannot exceed 3:1 during any in-water training.
    • Maximum depth of 100 feet/30 meters.


    Training Materials

    GUE training materials and recommended reading as determined by the course study packet received via online download after GUE course registration.

  • Topics

    Academic Topics

    • Introduction: GUE organization and course overview (objectives, limits, expectations)
    • Purpose
    • Common components of the rebreathers and how they function
    • Inherent risks of rebreathers
    • Rebreather operation, alarms, and warnings
    • Oxygen risks: hypoxia, hyperoxia
    • Decompression consideration while using semi-closed rebreathers
    • Oxygen loading, potential drop, adjusted deco
    • Equipment configuration
    • Problem recognition and management
    • The importance of instinctive physiological monitoring
    • Pre-dive planning
    • Post-dive procedures
    • Need for continuing education and skill reinforcement


    Land Drills and Topics

    • Flow checks
    • Manifold failures
    • Gas addition failures
    • Gas sharing
  • Skills & Drills

    • Demonstrate a safe and responsible demeanor throughout all training.
    • Demonstrate proficiency in underwater communication.
    • Demonstrate basic proficiency managing a rebreather configuration.
    • Demonstrate reasonable proficiency with use of the rebreather during ascents, descents, and diving.
    • Demonstrate good buoyancy and trim, i.e. approximate reference is a maximum of 20 degrees off horizontal while remaining within 3 feet/1 meter of a target depth.
    • Must be able to swim at least 500 yards/450 meters in less than 14 minutes without stopping. This test should be conducted in a swimsuit and, where necessary, appropriate thermal protection.
    • Must be able to swim a distance of at least 60 feet/18 meters on a breath hold while submerged.
    • Demonstrate ability to manage gas failures, including valve manipulation, gas sharing, and regulator switching as appropriate.
    • Recognize, assess, and review diving limitations.
    • Skillfully demonstrate gas failure procedures, including valve manipulation, gas sharing, and regulator switching, as appropriate.
    • Demonstrate the ability to manage a flooded rebreather while discharging excess water.
    • Demonstrate the ability to diagnose and correctly respond to simulated rebreather problems.
    • Demonstrate effective valve management.
    • Demonstrate proficiency in removing/attaching stage and/or decompression cylinders while hovering horizontally.
    • Demonstrate the ability to comfortably switch gasses while maintaining good trim and neutral buoyancy.
    • Demonstrate proficiency in safe diving procedures, including assembly, vacuum and pressure tests, pre-dive preparations, pre-dive vacuum test, flow check, in-water activity, and post-dive assessment and breakdown.
    • Efficiently and comfortably demonstrate how to donate gas to an out-of-gas diver while using the rebreather.
    • Be able to comfortably demonstrate use, manipulation, and failures of the gas addition system.
    • Demonstrate awareness of a team members’ rebreather function and a concern for safety, responding quickly to visual indications and dive partner needs during diving and failures.
  • Equipment Requirements

    Equipment Requirements


    GUE base configuration as outlined in Appendix A, plus:

    • Modified tank configuration as appropriate for GUE approved Rebreather
    • Modified regulator configuration as appropriate for GUE approved Rebreather
    • Bottom stage
    • Two decompression bottles

    Explore GUE Standards

    Prior to the commencement of class, students should consult with a GUE representative to verify equipment requirements and appropriateness of any selected equipment.


© 2020 by BLUEGRAVITYSCUBA. Proudly created with a passion for diving.

  • White Facebook Icon
  • White Instagram Icon