TDI Dräger Dolphin SCR Diver
Master semi-closed rebreather systems, extend bottom time, and operate with precision using the Dräger Dolphin
Duration
3 days, 4 dives
Max Depth
Limited by PO₂ (max 1.6 ATA) and gas selection
Level
Technical (Rebreather Entry – SCR)
Next Step
Advanced SCR / CCR Diver
Overview
The TDI Dräger Dolphin SCR Diver course introduces divers to semi-closed circuit rebreather (SCR) diving using the Dräger Dolphin unit.
SCR systems recycle a portion of the breathing gas, improving efficiency, reducing gas consumption, and extending dive duration compared to open circuit systems. Training focuses on unit-specific operation, gas flow management, and failure response, where constant awareness and disciplined procedures are essential.
Divers learn to operate a life-support system, where gas composition is actively managed through fixed mass flow and monitoring procedures, requiring precision and immediate corrective action when needed.
At N9BO℠, this course is delivered as systems-driven training, developing control, redundancy awareness, and structured problem-solving under operational conditions.
Course Facts
- Course name: TDI Dräger Dolphin SCR Diver
- Level: Technical rebreather (entry-level SCR)
- Minimum prerequisites: Minimum age 18 (15 with consent), TDI Nitrox Diver (or equivalent)
- Ratio: Maximum of 6 students per instructor (small groups recommended for quality training)
- Configuration: Dräger Dolphin SCR with bailout open circuit system
- Depth / environment: Maximum depth 40 metres / 130 feet, without decompression, and limited by a maximum PO₂ of 1.6 ATA and gas selection
- Format: Academic development + unit workshop + confined water + open water dives
- Duration: Typically completed in 3 days (Minimum 4 open water dives with at least 100 minutes accumulated bottom time)
What You’ll Learn
- Assemble and configure the Dräger Dolphin SCR.
- Pack and manage scrubber material.
- Monitor PO₂ indirectly through system management.
- Execute bailout procedures to open circuit.
- Respond to failures including flooding, gas issues, and system faults.
Prerequisites
- Be at least 18 years old (15 with parental consent).
- Hold TDI Nitrox Diver certification (or equivalent).
- Be medically fit for diving.
FAQ
The Dräger Dolphin is a semi-closed rebreather (SCR) that uses fixed mass flow rates and nitrox mixtures to maintain a breathable gas mix while recycling part of the breathing gas.
Depth is not fixed — it is limited by:
- Gas mixture used
- Maximum PO₂ (1.6 ATA)
- Manufacturer recommendations
SCR diving offers:
- Reduced gas consumption
- Extended bottom time
- Warmer, more humid breathing gas
, but requires strict monitoring and procedural discipline.
- Hypoxia / hyperoxia
- Incorrect flow rate selection
- CO₂ buildup from scrubber failure
- Loop flooding
Upon successful completion of this course, you may engage in no decompression diving activities utilising the unit-specific semi-closed-circuit rebreather to a maximum depth of 40 Metres/130 Feet, without decompression, utilising nitrox mixes not exceeding your level of certification.
Ready to Enter Rebreather Diving?
Send us your certifications and experience. We’ll guide you into rebreather diving with structure, discipline, and precision.
Go Pro with TDI Dräger Dolphin SCR Instructor
Advance into rebreather instruction and train divers to operate life-support systems safely and effectively using SCR platforms.
