Advanced Mixed Gas CCR Diver

Requirements

• Minimum age: 18 years old.
• Certified TDI CCR Mixed Gas Diluent diver, or equivalent from agencies recognized by TDI.
• Have a verified log of a minimum of 100 hours as a certified CCR diver over a minimum of 100 dives; a minimum of 50 hours and 50 dives must be on the unit specific CCR.  Fifty percent of these dives must be deeper than 30 meters / 100 feet and a minimum of 20 logged CCR dives requiring staged decompression. All dives to be deeper than 9 meters / 20 feet.

What will you learn?

Theory:

• Gas Physiology.
• Formula Work.
• Dive Tables.
• Dive Computers.
• Decompression in a CCR.
• Dive planning.
• Unit-specific checklist.
• Equipment Maintenance.
• Loop configuration.
• Additional fitted equipment and modifications.
• Emergency Procedures.

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.
• 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 per tank
  • ​O2 100% 13 CUF. US$ 25 per tank
  • ​Trimix 21/35 80 CUF. US$ 85 per tank
• 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.