+44 (0) 28 91861686

EXTENDED RANGE Go past the limits of recreational diving.

The TDI Extended Range Diver with DV Diving

Certain areas of the world provide spectacular dives at depths deeper than 39 metres/130 feet but you may not have access (or very limited access) to helium. The TDI Extended Range course teaches you the proper techniques for utilizing compressed air as a breathing gas, and with a maximum depth of 55 metres/180 feet, so you don’t have to miss those dives! The TDI Extended Range Diver Course provides the training and experience necessary including proper techniques, equipment requirements, and hazards of deep air diving, to competently utilize air for dives up to 55 metres/180 feet that require staged decompression, using nitrox mixtures or oxygen during decompression.

What You Learn

The TDI Extended Range Diver Course takes an in-depth look at all of the following and more:

  • History of deep air diving
  • Physics of diving including:
      • Pressure review
      • Formulas for solving dive planning problems, maximum operating depth (MOD), best mix, and more
  •  Physiology of diving including:
      • Hypoxia
      • Oxygen toxicity
      • Nitrogen narcosis
      • Nitrogen absorption and elimination
      • Carbon dioxide toxicity
      • Carbon monoxide
      • Hypertermia
      • Hypothermia
  • Decompression Options
      • Air
      • Nitrox
      • Oxygen
  • Equipment considerations
  • Dive tables
  • Dive Planning:
      • Operation Planning
      • Team Planning
      • Emergency Planning
  • Diving procedures
  • Descent considerations
  • Ascent considerations
  • Technical dive support
  • Navigation



You must:

  • Be a TDI Advanced Nitrox Diver (or hold a qualifying certification from another organisation)
  • TDI Decompression Procedures Diver (or hold a qualifying certification from another organisation)
  • Have a minimum of 100 logged dives, of which 25 must be deeper than 30 metres
  • Be at least 18 years old
  • Have a medical statement signed by your physician

For more information about this or other TDI courses have a chat with one of the DV DIVING Team members.


The Cost

  • TDI Extended Range Diver- £600

Excluding: Twin set rental & gas mixes