Expedition Mixed Gas Rebreather Diver 75m

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Inspiration Expedition Mixed Gas Closed Circuit Rebreather Diver - 3 days

The Professional Scuba Association International’s (PSAI) Fundamentals Mixed Gas Closed Circuit Rebreather Diver course is designed for those divers who wish to use a Closed Circuit Rebreather with a trimix diluent during their diving activities. A diver able to dive with a rebreather and two or more off-board bailout cylinders in the company of at least one other certified diver without supervision in conditions similar to those experienced during this course to 75m


We can also supply CCR units from new cheaper than direct sale and parts for all the Ambient Pressure Units through our trade department.


Course Objectives

The PSAI Expedition Mixed Gas Closed Circuit Rebreather Diver Course student will be able to demonstrate proper Rebreather care and maintenance, both pre and post dive. The student will also demonstrate proficiency in the skills outlined below Skill Requirements, of this outline.


Course Qualifications

A diver able to dive with a rebreather and two or more off-board bailout cylinders in the company of at least one other certified diver without supervision in conditions similar to those experienced during this course.


Prerequisites for Course Entry

  • The student shall be at least 18 years old at time of course entry.
  • Certification - The student shall have graduated from a PSAI Fundamentals Mixed Gas Rebreather Diver course or equivalent (RTC Technical Level 1).
  • Prior Dive Experience - The diver must have at least the competencies described in the PSAI Advanced Rebreather Diver (Decompression Diving) standard. In addition, they shall have logged 50 hours of experience since previous quailfcation with a CCR with at least 50% of them logged on the same configuration of CCR to be used in the course.
  • Medical Screening
    Documented evidence shall be obtained that the student has been medically screened as suitable for recreational diving by means of an appropriate questionnaire or medical examination. In any case of doubt, or at the instructor’s discretion, students shall be referred to proper medical resources. If the student is not examined by an appropriate medical professional (e.g. physician) the student shall be obliged to confirm by signature that he or she has understood written information given by the instructor on diseases and physical conditions which may pose diving-related risks.


Course Minimums and Standards

Classroom Hour

  • Approximately 8 to 12 hours for classroom and practical demonstration (oxygen analysis, helium analysis, equipment marking and equipment rigging) are required to complete the PSAI Fundamentals Mixed Gas CCR Diver course.

Confined Water Dives

  • All new skills shall be introduced in shallow water and all critical skills should be mastered by the student in that environment before attempting them in open water.

Open Water Dives

1. The complete PSAI Expedition Mixed Gas CCR Diver course consists of six (6) dives required of 60 minutes duration each.
2. To achieve certification all dives are using a trimix diluent and one dive in each phase must be within three (3) meters (10 feet) of the desired certification level.
3. Oxygen percentage is no lower than 13% (+/- 1%). The maximum depth is 75 meters or 200 feet.
4. Students shall have experience of at least 80% of the specified maximum working depth during this course.
5. Planned stage decompression dives will be included in the course.
6. For any training dives that do not include required decompression stops, safety stops are required.

Breathing Gas

1. Acceptable Gas Mixtures
Course participants must be trained in the use of heliox and normoxic trimix mixtures with a recommended END of 30 metres/100 feet or shallower and an absolute maximum END of 40 metres/130 feet. Air may be used as a diluent for shallower training dives.
2. Maximum Oxygen Partial Pressures

a. The maximum PO2 during the dive is 1.4 bar.
b. A maximum PO2 of 1.6 bar can be used during the decompression phase of the dive or for emergency open circuit bailout.
c. On-board diluent gases must have a maximum PO2 of 1.1 bar at the expected maximum operating depth.


Course Instructional Materials Requirements

  • All students will use the PSAI Mixed Gas Diver manual and Closed Circuit Mixed Gas Diver manual and appropriate dive planning materials.
  • All students will use the manufacturers recommended documents or instruction manual for the chosen Rebreather.
  • PSAI Rebreather instructors will use this Standard and the PSAI Mixed Gas Closed Circuit Rebreather Diver Course Guide, as a minimum.

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Course Equipment Requirements

  • Standard Rebreather diving equipment appropriate for the environment of the CCR Mixed Gas dive. For all oxygen concentrations in excess of 40% by volume, or as specified by the individual equipment manufacturer or local regulation, all regulators and high-pressure equipment shall be appropriately oxygen cleaned.

  • Oxygen Analyzer equipped with an appropriate flow restrictor assembly/interface. An additional oxygen analyzer without an appropriate flow restrictor assembly/interface may also be shown, but only as an adjunct. The instructor should demonstrate how these secondary devices, if used, may result in inaccurate measurements.

  • Helium Analyzer with appropriate interface assemblies. An instructor may use a combination analyzer that has the provision to measure both oxygen and helium in the same unit.

  • Nitrox cylinder(s), appropriately cleaned, marked and maintained appropriately rigged as stage/decompression cylinders with an appropriately cleaned and serviced regulator and pressure gauge.

  • Two Delayed Surface Marker Buoys (DSMB) and appropriate main reel and backup reel or spool. One DSMB to be in fluorescent red and one in fluorescent yellow.

  • Redundant regulator/ADV, redundant time and depth monitors and redundant line cutting devices. Appropriate back-up tables and run-time schedules shall be used even in conjunction with dive computers.


Curriculum Requirements

The PSAI Expedition    Mixed Gas CCR Diver course requires the use of a PSAI Mixed Gas CCR Diver manual. This manual will have all the necessary information to appropriately cover, in the detail necessary for this level of certification, the following areas of information:

History of Re-breather Diving.

  • Early techniques of Mixed Gas Diving.

  • Evolution of Mixed Gas Diving Courses.

  • PSAI’s involvement in Mixed Gas Diving Courses.

  • Mixed Gas diving and Rebreathers.

Review Physical Principles of Mixed Gas Diving.

  • Pressure.
  • Boyle’s Law.
  • Dalton’s Law.
  • Charles’ Law.

Physiological Principles of Mixed Diving.

  • Gases Appropriate for Mixed Gas Diving.
  • Helium Gas Considerations.
  • Hypoxia, Hyperoxia, Hypercapnea review.
  • Hazards of Excess Oxygen.

  • Decompression Models.

  • Effective (Accelerated) Decompression.

Equipment for Extended Range Diving.

  • Standard Equipment.
  • Additional Cylinder and Valve Considerations.
  • Manufacturer’s Recommendations for depth and Carbon Dioxide uptake.
  • Stage/Decompression Cylinder Recommendations. Regulator Selection.
  • Buoyancy Compensator Considerations.
  • Redundancy Requirements.
  • Organization and Rigging of Mixed Gas Equipment on the Rebreather.

Dive Planning.

  • Equivalent Air Depth and Metabolic oxygen calculations, setpoint calculation review, gas density calculations affecting CO2 retention at depth. Use of Dive Computers.
  • Mixed Gas Dive Planning Tables.
  • Computer Generated Dive Profiles.
  • Support Procedures.
  • Nitrogen and Oxygen Limitation Review.

Gas Management Planning.

a. Bottom Gas Requirements.
b. Decompression Gas Requirements.

Descent and Ascent Techniques and Considerations.

a. Down Lines.
b. Navigation from Shore or Vessel.
c. Reference Magnetic Headings.

Problem Solving.

  • Configuration for use, carrying bailout.
  • Loop floods, mouthpiece loss, bag rupture.
  • Use and abuse of electronic monitoring equipment.
  • Scrubber monitoring and exhaustion..
  • User Maintenance and service periods.


By the end of the course the candidate shall have an appropriate knowledge of the following concepts for rebreather diving (course content should include all the following concepts unless inapplicable for the rebreather model used):

A. All of the theory competencies outlined in the Technical Rebreather Diver Level 1 standard
B. Additional equipment required to be able to conduct decompression dives
C. Planning for redundancy of key life-support equipment
D. Techniques to be able to conduct decompression diving
E. Ensuring adequate bailout gas available for safe exit at any point during dive
F. Staying within maximum limits to avoid central nervous system (CNS) oxygen toxicity
G. Effect of gas density on breathing resistance
H. Planning and conducting decompression dives
I. Manual operation of a functioning rebreather
J. Manual control options to manage a malfunctioning rebreather
K. Techniques for:

1. Removing and replacing two bailout cylinders at the surface and underwater
2. Exchanging a bailout cylinder with another diver while stationary in mid-water and maintaining neutral buoyancy

3. Exchanging a bailout cylinder with another diver during a simulated open circuit bailout ascent
4. Diluent flush
5. Use of CCR in SCR mode
6. Manual oxygen control
7. Manual diluent control
8. Manual setpoint control during ascent
9. Off-board plug-in to a CCR of oxygen and diluent gas supplies


Skill Requirements

Land Based -

A PSAI Expedition Mixed Gas Closed Circuit Rebreather Diver student shall:

  • Plan Mixed Gas CCR dives based on specified gases, setpoint and dive depths.
  • Properly pack and repack an absorbent canister using granular fill absorbent material. If pre-packed absorbent canisters such as “Extend-Air” are available, ensure these are fitted and used also.
  • Properly assemble and test a Rebreather prior to every dive.
  • Properly conduct pre-dive and pre-breathe checks prior to all dives.
  • Properly conduct all maintenance. Verify equipment suitability and markings.


Confined Water

  • All new skills shall be introduced in a confined water situation and all critical skills should be mastered by the student in that environment before attempting them in open water.

  • At the PSAI instructor’s discretion, confined water exercises may be conducted to familiarize the student with equipment rigging and placement, etc


Open Water - A PSAI Expedition Mixed Gas Closed Circuit Rebreather Diver student shall, in addition to confirming abilities required of previous courses:

  • Conduct the dive according to their plan, as approved by the PSAI instructor.

  • Monitor gas pressures and surface with an acceptable safe margin.

  • Not to exceed any Maximum Operating Depth or Oxygen exposure limitations.

  • Correct setpoint choice.

  • Not to exceed any absorbent limitations.

  • Perform buoyancy control drills both at depth greater than 30 meters (100feet) and in shallow water 6-10 meters (20-33 feet).

  • Perform gas switch skills where required by equipment on two (2) separate dives.

  • Record and compare gas usage upon completion.

  • Deploy a reel and surface marker buoy from a stationary position on the bottom phase of a dive

  • Use the reel for all ascent practice.

  • Deploy a reel and surface marker buoy from a hover position on the bottom phase of a dive once.

  • Use the reel for all ascent practice.

  • At 18 meters deploy as second fluorescent yellow SMB to simulate a loss of gas scenario.

  • Conduct accurate safety stops.


Practical Skill Requirements

The student shall have experience of at least 2 dives/water sessions during the course.
By the end of the course the candidate shall be able to perform the following skills (course content should include all the following items unless inapplicable for the rebreather model used):

A. All of the practical competencies outlined in the PSAI Advanced Rebreather Diver standard
B. Remove and replace two bailout cylinders at the surface and underwater
C. Exchange a bailout cylinder with another diver while stationary in mid-water and maintaining neutral buoyancy
D. Exchange a bailout cylinder with another diver during a simulated open circuit bailout ascent
E. Manual operation of the functioning rebreather
F. Use an off-board plug-in diluent gas supply to diver's CCR
G. Use an off-board plug-in oxygen gas supply to diver's CCR
H. Manual setpoint control during ascent
I. Manual response(s) to the following rebreather malfunctions (if applicable to the specific rebreather):

1. Hypoxia
2. Hyperoxia
3. Hypercapnia
4. Cell problems
5. Loss of diluent
6. Loss of oxygen
7. Other rebreather warnings/alarms as appropriate

J. Use of CCR in SCR mode
K. Rescue of a rebreather diver
L. Conduct of decompression or safety stops
M. Switching to off board bail out and conducting an ascent
N. Correctly respond to simulated emergencies


Course Completion Performance Requirements

To be awarded the Professional Scuba Association International’s Fundamentals Mixed Gas Closed Circuit Rebreather Diver certification, the student must:

A. Attend all academic sessions.
B. Successfully master all academic and in-water skills.
C. Correctly set-up all electronic monitoring parameters fitted to Rebreather.
D. Correctly perform all dry land-based checks and maintenance.
E. Complete the PSAI Fundamentals Mixed Gas Closed Circuit Rebreather Diver written examination with a score of at least 80%. All questions shall be correctly answered or remediated and explained. Each level will have a separately reviewed exam.
F. Conduct the open water dives with appropriate skill and attention to all dive parameters and requirements, including maximum operating depths and adherence to decompression stop depths.
G. Perform a minimum of two (2) DSMB deployments for the purpose of decompression depth reference. The student will demonstrate the skill necessary to deploy the DSMB in an expeditious manner, completing the deployment in less than one (1) minute. Other dives may be performed utilizing anchor line reference or other natural references as long as the instructor has verified the competence of DSMB deployment.
H. Demonstrate navigational techniques appropriate for the CCR Mixed Gas dives performed.
I. Conduct correct post-dive cleaning and maintenance procedures.
J. Correctly plan, execute, and log the required dives.


The PSAI Instructor is responsible for ensuring that the Expedition CCR Mixed Gas Diver student has demonstrated the appropriate respect and understanding for diving with helium-based diving gases as well as the various decompression gases. If the student fails to maintain proper depth control, gas management awareness, etc., the instructor must require additional training until the appropriate standards are achieved prior to certification.


A diver that successfully completes the second level of Mixed Gas CCR diving will be awarded certification credentials that verify their achievement of dives within 3 meters (10 feet) 75 meters (200 feet).


All levels of PSAI Rebreather certification cards are Brand & Model specific. The Brand and Model the student was trained on will be listed on the certification card. No “generic” rebreather certification cards will be issued by PSAI at any level.


Course Cost 

  • Expedition CCR Mixed Gas Diver 75m 2 dives £800


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