TDI Extended Range Diver

Course Overview & Training Objectives

TDI Extended Range Diver develops the operational knowledge and practical skills required to plan and execute staged decompression dives to 55m (180ft) using air or nitrox. The course directly confronts the physiological realities of deep air diving, including severe nitrogen narcosis, elevated gas density, and oxygen toxicity. Divers master multi-stage management with dual decompression bottles (typically EAN50 and 100% O2) for accelerated decompression profiles.

Operational Envelope

• Max Depth: 55m (180ft)
• Decompression: Unlimited (gas limited)
• Breathing Gases: Air or Enriched Air Nitrox; up to 2 decompression stage cylinders up to 100% O2
• Equipment Rig: Double + Stages

Course Structure & Training Requirements

• Course Duration: 4 to 6 Days
• Required Training Dives: 6 in-water dives
• Classroom & Theory: 16 hours instruction

Entry Gates & Prerequisites

Min age 18, 100 logged dives