Rebreather-Diver ECCR

Examination Purpose:

The Candidate has to prove, that he can do the drills which are related to safe diving and that he is able to react correctly in all imaginable emergency situations. He must also demonstrate that he understands the function and interplay of all gear components and is able to do all the Pre- and Postdive- Servicing and Tests of his Equipment without Supervision. The practical proficiency is tested in six exam-dives; what number does not include the educational dives before. The obligatory total "In-Water-Time" of this class is at least six hours of time.


Test Block: "Application"



Couch & Workbench:

Filling the Absorber, Predive Checks, Briefing, Casuality -Plans, propper Rigging, Sensor Calibration, Prebreathing the Loop.

  • Harness Adjusting
  • Running the Maintenance&Refill-Log (Gerätebegleitheft)
  • Fixing "Cell 2 Failure - NO DIVE", explaining how to prevent Cell failures best.
  • Finding and clearing Slave "Low-Batt", explaining the concerned correct procedures.
  • Fixing Battery- Contact- Problems.
  • Various methods to check the direction- valves
  • Positive- and negative Pressure Checks
  • Finding and Fixing Leakage in the Breathing-Loop.
  • Checking the OC-Regulators
  • Checking the Breathing-Gases, was for example EAN80 delivered instead of Air or Nitrox instead of pure Oxygen ?
  • Location and Clearage of an IP-Leak.
  • Checking of the IP-Pressures
  • Calibration
  • Switching between the Setpoints
  • Passing the Master-Function to the other Controller
  • Changing the Setpoints
  • Reading out the Runtimers, starting from the high Setpoint
  • Blind unplugging the Dil. Inflator- hose under pressure, later finding and replugging it blind.
  • Blind unplugging the Oxygen Inflator- hose under pressure, later finding and replugging it blind.
  • Correct reaction to a broken out Inflator- Pin.
  • Correct interpretation of ppO2='2.55' on 6m
  • Validation of the Sensor-Readouts (including strange Sitruations like: freezed readings, two sensors are wrong, all 3 sensors have lost linearity and so show the same but not linear readout).
  • Explaining why it's no good to recalibrate by solenoid when on 50m.
  • Correct reaction to "Solenoid struck closed" caused Low-ppO2 Warning,.
  • Correct reaction to "Oxygen suddenly empty" caused Low-ppO2 Warning.
  • Correct reaction to High-ppO2 Warning
  • Correct reaction to Dumbness / Intoxication
  • Correct handling of the Situation "the Lime is damp after the dive"
  • Correct handling and possible explanations of the Situation "Water droplets in the Display"
  • Correct reaction to Battery warning under Water
  • Correct reaction to "Cell Error"
  • Correct reaction to "gurgle sound in the Breathing-Hose"
  • Correct reaction to "gurgle sound in the Scrubber"
  • Correct reaction to "Lye is coming"
  • Correct reaction to negative rel. Pressure in the Breathing- Loop (avoiding of Lung underpressure-Barotrauma = "Tauchersturz")
  • Correct reaction to overpressure in the Breathing- Loop / intercept an ongoing pop-up
  • Flushing to the "pure Oxygen- Mode"
  • Cleaning, desinfection and drying the Rebreather
  • Correct storage of the Rebreather between Dives / for Months

The candidate shall demonstrate that he has understood the specific procedures and can perform them without thinking about too long.


Filling / checking the Absorber, correct rigging, Briefing/Checks, Emergency Plans, Sensor Calibration, Warmbreathing the loop. Bubblecheck on 6m (all the specific Safety- Checks are to be done self-evident before/during each dive and so they are not named here repeatedly ).

The candidate shall demonstrate on each dive that he has understood the safety relevant procedures and can perform them without thinking about too long.

20 Minutes to 12m or more, during the dive taking off and on the mask in 10m depth (in very cold water lifting and clearing the mask is sufficient). Switching from the Loop-Mouthpiece to an OC-Regulator and afterwards changing back to the "lost" Mouthpiece. On the ascent: on 4m: flushing the Loop to the O2-CCR-Mode and performing 3 Minutes Safety- Deko in this Mode. During this stop: Demonstration of the UW-Menu functions. Post-Dive-Briefing/Post-Dive-Checks, correct care and stowing of the equipment.

The candidate shall show that using the rebreather does not harm doing ordinary dive-tasks, that he masters the rebreather mouthpiece and that he does not forget about safety relevant Procedures.


20 Minutes to 12m or more, Buoyancy-exercise: on 12m the diver trims by shifting gas from the Loop to the BC with his mouth, he must reach hydrostatic balance within short time. On various depths he has to fine-trim so that he keeps a distance of about 1-2m to the ground.

The candidate shall show that even repeated switching between mouthpieces does not kick him out of concept, plus that he has understood how to use the diluent- inlet as an universal tool.

Switching to "High-Setpoint" when reaching the dive-depth or at the latest when reaching 20m. Demonstrating the Knowledge of the additional hand- signs (Reading the situation description and giving adequate signs). At the end of the dive Simulation of a controlled emergency ascent (on the same depth with the tester) from a depth of 5m, without mouthpiece in, with controlled breathing out during the ascent.

The diver shall show that he does not forget switching between the setpoints, not on the descent nor on the ascent. He shall also show that he acts in teamwork and can and does communicate adequate.


20 Minutes to 12m or more, Diveleadership. A Diver breaths for 5 Minutes from the secondary System of the Candidate. After 10 Minutes Ascending, taking a bearing in 100m Distance with the compass. In 3-5m of Depth diving towards that Point, maximal allowed Course- Deviation +/-10 Meter.

The candidate shall demonstrate that he goes the safety relevant Procedures reliable, even though he has to fulfil other tasks.


Putting off and on of the diving apparatus while swimming free at the surface.

The diver shall show that he can, whenever needed, slip out or into his gear.

10 Minutes to 20m or more, Vest exercise: in 20m of depth shifting breathing-gas from the loop to the Vest until positive buoyancy is reached, ascent under regular breathing to 9m, without using fin- power.

The candidate shall prove that he has good control of his buoyancy and does not only use the loop for it.

Continuing of the dive, yet Exercise-chain "'High Oxygen' Warning", "Solenoid/O2-Inlet does not close", "'low Oxygen' Warning", "Clusterflush as Sensor-Validation", "Usage as manual SCR, 'without' Computer (*)", "CO2 ?", "Water in the Loop" and "Bailout to OC".
"Failures" like above will also be added, as text- sheets to be proper reacted upon, to other of the exam- dives.

The diver shall demonstrate that he also under water reacts to specific failures the correct way.


20 Minutes to at minimum 20m, min. 15 Minutes of manual operation (*) with display-usage ( a) "Solenoid struck open" b) "Solenoid struck closed"), then change to regular Automatic- Parameter and speed- controlled ascent of 2 Minutes of minmum duration from 20m under breathing from the OC System. Finally 10 Minutes Snorkeling in the full Equipment.

The candidate shall show that he has clearly understood he specifics of closed circuit diving apparatus and that a solenoid failure means no acute danger for him.


20 Minutes to a minimum of 12m, Rescue of a "unconscious" Rebreather-Diver (assumption Hypoxia), including 50m Transportation ashore (or to the boat), followed by cardio-pulmonar resuscitation (simulated / phantom), shock treatment, stabile side positioning and noting the important facts of the "Accident-Dive".

The applicant has to show that he can do the necessary things rapidly and correct as well as can start a best possible treatment by medical professionals (rescue-chain).


The minimum Depth for the according dive is meant for poor visibility in cold Water, under better condition can thoroughly, within the scope of appropriate care, dived deeper.
The maximal depth for exam dives of this level is 25m, the maximum ppO2 1.4bar. For all the dives is the reliable monitoring of the Systems a relevant task.

(*) "Manual Operation" means that the Computer stay switched on, the intervention-'setpoint' for the solenoid will be set on a low value while the diver keeps the Oxygen-Partialpressure in the normal Range manually. "Without Computer" means that not the diver but one of his comrades has those under utmost careful observation.

With the word Vest is not meant to fix the type, integrated in the divesuit and den Jacked style cuts and so on are meant here as well.

Block-, Exercise- and Dive-Numbers are only for ease of form filling, they do not mean a obligatory chronological order. If fact you will mostly see that Theory is the first test, when "ABC" as condition test, performed for safety reasons (an condition check can be skipped if proved that this level was already recently (within 12months) fulfilled), and when the dives, ordered in a way that fits best to things like the momentary weather.

A valid medical attest that certificates unrestricted dive-fitness and a valid insurance coverage are obligatory for participation in the praxis. The complete exam is to be completed within 15Months.


Test Block: "Dive Theory"

An official PAN Test sheet for this level must be filled within 60 Minutes, each Block must be at minimum 80% correctly answered.


Test Block: "ABC"



750m Snorkeling, each case 250m, normal style, on the side, backstroke, all without arm-power and in the open water

The candidate shall show, that he has the necessary amount of specific basic physical fitness.


250m Snorkeling with only one Fin, arm-power is allowed, no further style limitations, has to be performed in the open water


35m Apneu-Diving


45 Seconds Apneu-Diving, aside covering a distance of 10 Meters or more


Within one Minute 2 repetitions of Apneu-Diving to a depth of five Meters; alternatively within one Minute 3 repetitions of Apneu-Diving to a depth of 4 Meters


Rescue of a "unconscious" Rebreather-Diver from a depth of 5m, in the open water, including 100m Transportation-Swimming ashore (or to the boat), followed by reanimation (simulated / phantom).

The applicant has to show that he can do the necessary things rapidly and correct.