ANDI Extended Range Diver (ERD) (L4)

Course Overview & Training Objectives

ANDI Level 4 training qualifies technical divers to plan and conduct staged decompression dives to 55m (180ft) using air, SafeAir, or normoxic trimix bottom gas. The curriculum bridges intermediate decompression diving into advanced deep-water management while addressing narcosis limits, equivalent narcotic depth (END), and gas density considerations. Divers master manifolded twinsets or technical sidemount configurations, dual-stage deployment, and team bailout contingencies under strict gas management protocols.

Operational Envelope

• Max Depth: 55m (180ft)
• Decompression: Unlimited (gas limited)
• Breathing Gases: Air, SafeAir, or Normoxic Trimix; up to 2 deco stages with 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

TSD or TTM