Mixed Gas CCR Diver
This is the intermediate level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for mixed gas diving. The objective of the course is to introduce divers to in the benefits, hazards and proper procedures for mixed gas diving specifically on CCR, utilizing a mixed gas diluent containing 16 percent or greater oxygen, and to develop intermediate CCR diving skills appropriate to technical diving to a maximum depth of 60 meters / 200 feet.
Duration: 7 Days
Depth: 60 m
BOOKING
Reservation confirmations require a 50% deposit. We accept bank transfer, credit card or PayPal. Full payment must be settled in Mexican pesos at the daily USD exchange rate or in cash prior to the start of your dive activity. Deposits for reservations are non-refundable, in certain circumstances, such as unforeseen medical issues or emergencies, the course or dive activities may be rescheduled. Any cancellation less than 24 hours prior to your first day of diving will be charged in full.
SCHEDULE
You can customize your course or dive trip according to your preferences and schedule throughout the year, we are open for training and diving seven days a week. The schedule can be adapted and subject to change due to weather conditions.
Requirements
Minimum age: 18 years old.
Provide a verified log of a minimum of 50 rebreather hours distributed over a minimum of 50 dives on the specific rebreather. Valid logged dives must be deeper than 9 meters / 20 feet, at least 20 must be deeper than 30 meters / 100 feet, and at least 10 dives requiring staged decompression. If the diver has 50 hours on another CCR unit recognized by TDI, only 25 hours/25 dives are required to be on the specific unit. If completing a unit crossover, provide proof of at least 10 logged CCR dives in the last 12 months.
Having TDI Air Diluent Decompression Procedures Rebreather / TDI CCR Helitrox Diluent Decompression Procedures Diver certification or equivalent from agencies recognized by TDI.
What will you learn?
Theory:
History and Evolution of Rebreathers.
Comparison of Open Circuit, Closed Circuit and Semi Closed Circuit Rebreather Systems.
Practical Mechanics of the System.
Gas Physiology.
Proper Scrubber Packing; according to the manufacturer’s recommendation.
Electronic or Manual Systems Design and Maintenance.
Dive Tables.
Dive Computers.
Dive planning.
Emergency Procedures.
Helium Considerations.
Skills
Build unit based on manufacturer’s specifications using manufacturer’s manual/build checklist.
Demonstrate familiarity with basic and intermediate hand signals.
Select and prepare equipment suitable for soft overhead environment with long decompression obligations.
Conduct team-oriented drills for lift bag deployment and bailout procedures.
Drills for buddy rescue.
Properly analyze all gas mixtures to be used.
Demonstrate adequate pre-dive planning.
Conduct pre-dive checks using TDI Pre-flight checklist.
Use START* before every dive.
Stress analysis and mitigation.
Show good awareness of team members through communications, proximity and team-oriented dive practices.
Demonstrate buoyancy control; ability to hover at fixed position in water column without moving hands or feet.
Mask removal and replacement, deploy backup mask.
Properly execute a recovery from a system failure and conclude the dive and decompression on open circuit gases carried from a depth greater than 30 metres/100 feet.
Demonstrate ability to plug in and share off-board gas, including sharing/swapping of off-board bailout cylinders.
Properly execute a recovery from system failure and conclude the dive and decompression with the unit in manual mode.
Gas shutdowns and loss of gas, correct choice and switching to off board gases.
Broken hoses, catastrophic failure scenarios.
Flooded absorbent canister.
Cell errors.
SCR drill (minimum of 10 minutes).
Oxygen rebreather mode in depths less than 6 meters / 20 feet
Stop at 3-6 meters / 10 – 20 feet on descent for leak bubble check.
Demonstrate competence managing 2 bailout cylinders, including drop and recovery while maintaining position in the water column.
Deployment of a lift bag / delayed surface marker buoy (DSMB) at depth and mid water
Simulate failed lift bag / DSMB deployment.
On 2 of the dives, demonstrate an ascent with ascent reel and lift bag and perform staged decompression.
Electronics systems monitoring for PPO₂ levels.
Cell validation checks with appropriate use of diluent and oxygen.
Proper execution of the dive within all pre-determined dive limits.
Demonstration of decompression stops at pre-determined depths.
Demonstrate controlled ascent with simulated toxed diver including surface tow at least 50 meters / 165 feet with equipment removal on surface, in water too deep to stand in.
Included throughout the course:
Private instructor.
Classroom sessions.
Transport to the cenotes or boat from the shop.
Single, CCR, Sidemount and Doubles tanks.
Weights.
EAN 32 fills.
Certification card.
Water and snacks.
Not included:
Cenote entrance fee (x day between US$ 10 15).
Basic diving gear
Manual or elearning.
O2, Deco Gases and Trimix (when applicable).
Lunch.
Diving insurance.
Additional Services
Equipment rental and/or sale
Basic diving gear
Rental US$ 5 each x day (Wetsuit, Mask, Boots, Fins)
GASES Example
EAN 50, 80 CUF. US$ 21 por tanque
O2 100% 13 CUF. US$ 25 por tanque
Trimix 21/35 80 CUF. US$ 85 por tanque
Cave Equipment
Sidemount Harness (Rental US$ 20 x day).
Sidemount Regulator Set (Rental US$ 25 x day).
Twinset Wing / Backplate (Rental US$ 20 x day).
Twinset Regulator Set (Rental US$ 25 x day).
Stage Regulator and Rig ( US$ 15 x day).
Cave Primary Light (US$ 20 x day).
Backup Light (US$ 5 usd x day).
Scrubber
EAC Cartridge US $85 (4-5 hours scrubber)
Sofnolime 8 – 12 US $2 x lb.
Important Information:
Plan carfully your trip to minimize your enviromental impact, please avoid sunscreen / mosquito repellent or other skin products for all water activities. Whenever possible, choose rechargable batteries and aviod to carring things like disposable razors, plastic bags, plastic water bottels, etc. We are in a very fragil and pristine enviroment and is our responsability to keep it that way.
CCR diving is a highly demanding activity with a specific mindset and requires very good trim, buoyancy, propulsion, and awareness. We will do our best to improve your skills and knowledge, also we will set the best training plan according to the skills and experience of each diver to help them to succeed in the course but consider sometimes we need extra days to achieve the goals with a classroom or water sessions and we apply extra rate if is necessary. We strongly recommend to the students plan at least two extra days just in case.
Notes:
Please bring change of clothes & towels for cenote training days.
All courses are available in English or Spanish.