Donarun Das is recognized as one of India's top technical diving instructors, blending deep exploration experience with professionalism and safety-first teaching. His record—including completing the country’s deepest civilian dive and leading cave expeditions—means you’ll learn from someone who not only teaches technical skills but lives them. Das emphasizes mastery over minimum requirements, coaching students in buoyancy, team communication, equipment configuration, and real-world problem-solving that elevate your competence and confidence.

PADI Tec 40 introduces you to technical diving using tec equipment and protocols while remaining close to recreational limits:

• Conduct limited decompression dives to 40 meters
• Use a single decompression gas up to EANx50 (50% oxygen)
• Basic gas management and technical planning skills
• Learn proper equipment handling, including backmount and sidemount configurations

PADI Tec 45 takes you deeper and builds upon Tec 40 skills:

• Plan and execute decompression dives to 45 meters
• Use nitrox and up to 100% oxygen for decompression
• Practice emergency protocols including handling equipment failures
• Develop greater planning independence and situational awareness

PADI Tec 50 completes your entry-level technical training:

• Dive up to 50 meters with two decompression gases
• Conduct extended, multi-stop decompression dives; gas-switching for safety
• Learn to plan and execute your own technical dives
• Prepare for moving into advanced tech and rebreather (CCR) training

Sidemount is a streamlined setup where tanks are worn at your sides rather than on your back. This configuration offers:

• Increased flexibility and comfort, especially in tight spaces and caves
• Easier tank handling and redundancy for decompression dives
• Promotes good trim and buoyancy—the foundations of safe technical diving

Combining sidemount with Tec 40 lets you build versatile skills and adapt to different diving environments, especially important if you advance into cave, wreck, or exploration diving.

Training sidemount diving with Donarun Das offers the unique combination of world-class expertise and a strong technical background. Donarun is an accomplished technical instructor and cave explorer, recognized for a meticulous, mastery-based teaching style. Students benefit from his extensive hands-on experience, careful focus on equipment configuration, problem-solving, and personal mentorship throughout the course—ensuring you gain highly practical skills and superior in-water performance.

Sidemount diving is a configuration where diver(s) wear their tanks at their sides rather than on their back. Originally developed for cave explorers needing greater flexibility and access in tight spaces, sidemount has become popular for both recreational and technical divers. The approach emphasizes streamlining, comfort, and simplicity while providing redundancy and easier control of multiple tanks.

• Increased comfort and flexibility: Tanks are easier to don and remove in the water.
• Improved trim and buoyancy: Streamlined profile enhances control and reduces drag.
• Redundancy: Independent gas supply from separate tanks increases safety for both recreational and technical dives.
• Accessibility: Better access to valves and regulators, especially important for troubleshooting or emergency procedures.
• Reduced back strain: No need to carry heavy tanks on the back when entering/exiting the water.

Combining sidemount with Tec 40 introduces the diver to technical procedures with the additional benefits of sidemount configuration. Sidemount’s redundancy, gas management, and flexibility complement the decompression diving, advanced planning, and equipment handling skills developed in Tec 40:

• Enhances safety and gas management for staged decompression dives.
• Prepares divers for future cave, wreck, and deep exploration.
• Builds confidence and foundational skills that are directly transferable to advanced technical or overhead environment diving.

Sidemount with Donarun Das is the ideal springboard for divers aspiring to excel in both recreational and technical environments, delivering real-world skills and inspiration for further technical adventure.

Donarun Das stands out for his leadership in technical diving across Asia, recognized as India’s deepest civilian diver and an international instructor for CCR (Closed Circuit Rebreather), mixed gas, and cave diving. His teaching combines technical mastery with practical exploration, offering personalized coaching and safety-driven skills built around mastery, not just certification. Learners benefit from his vast experience in deep, overhead, and decompression environments and gain insights from an instructor who is an innovator in both dive technology and exploration.

CCR diving uses a rebreather unit that recycles the diver’s exhaled gas, removing carbon dioxide and replenishing oxygen, allowing for nearly complete usage of breathing gas. Unlike open-circuit scuba where exhaled bubbles are lost to the water, CCRs offer silent operation, optimal gas mixtures at any depth, and minimal bubble emission, which is crucial for research, photography, and approaching marine life.

• Extended dive times and gas efficiency: Nearly all inhaled gas is reused so dives become much longer, even at depth.
• Decreased decompression obligations: Divers can optimize inert gas exposure, reducing or even eliminating decompression in some profiles.
• Minimal bubbles: This lowers disturbance to marine life and improves stealth for scientific, photography, and cave diving applications.
• Warm, moist breathing gas: Improved comfort, especially on long or cold dives.
• Significant cost savings on helium and specialty gases: More economical for repeated and deep technical dives.

A comprehensive CCR course includes:

• Unit setup, operation, and maintenance
• Buoyancy control and loop volume management
• Gas and scrubber management
• Emergency procedures for component failures and gas problems
• Practice dives (typically at least 8) focused on real-world skill development and troubleshooting in open water
• Theory sessions: Dive planning, decompression, and equipment configuration
• Experience progression: Preparing divers for continued training in deeper or more challenging technical environments

Donarun Das offers CCR courses and try dives across India, Sri Lanka, and the Maldives, tailored to diver needs from beginner through advanced technical and cave rebreather training.## FAQs for CCR Training.