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Regular price £400.00 GBP
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Who is this course for?

The certified Advanced Diver or Intro to Tech Diver looking to expand their knowledge of decompression theory and diving techniques using helitrox.

The certified Advanced Diver or Intro to Tech Diver who is interested in extending their bottom time.

The certified Advanced Diver or Intro to Tech Diver who has interest in moving forward with technical diving education.

Course prerequisites

Minimum age 18

Minimum certification of Advanced Diver (with Deep specialty) or TDI Intro to Tech Diver, or equivalent

Certified as TDI Advanced Nitrox Diver (unless being taught concurrently)

Proof of 50 logged dives

What you can expect to learn

Decompression dive planning including:

Gas requirements

Oxygen limitations

Nitrogen limitations

Helium limitations

Decompression gas choices

Tables vs. personal dive computers

Emergency and contingency planning (equipment failure, omitted decompression, etc.)

Helium as a breathing gas

Effects on narcosis

Effects on respiration

Effects as an insulator

Counter diffusion


Decompression diving procedures

Equipment selection

Pre-dive checks and drills

Stress analysis and mitigation

Following a decompression schedule

Gas switching

Team awareness and communication

SMB/lift bag deployment

Proper trim, buoyancy and propulsion techniques

Emergency procedures (equipment failures, catastrophic gas loss, omitted decompression, navigational errors, etc.)

Equipment considerations, cylinder labeling, analyzing nitrox mixtures, and gas blending procedures

What's in it for you?

Ability to conduct decompression diving activities without direct supervision utilizing helium and/or nitrox mixtures provided:

The diving activities approximate those of training

The areas of activities approximate those of training

Environmental conditions approximate those of training

Breathing mixtures do not contain more than 35% helium or less than 21% oxygenAbility to enroll in TDI Extended Range, TDI Advanced Wreck, TDI Trimix courses

Helitrox Diver minimum requirements

Satisfactorily complete the TDI Helitrox Diver Course written examination with a passing score of 80% followed by 100% remediation by the instructor.

Complete all open water requirements safely and efficiently.

Demonstrate mature, sound judgment concerning dive planning and execution.

View full details

The TDI Helitrox Diver Course examines the theory, methods, and procedures for planning staged decompression dives utilizing helium in the breathing mixture to reduce the effects of inert gas narcosis.

The TDI Helitrox Diver Course trains divers how to plan and conduct staged decompression dives to a maximum depth of 45 metres/150 feet. The most common equipment requirements, gear set-up, and decompression techniques are also presented during this course. Students are permitted to utilize enriched air nitrox and helium mixes with no greater than 35% helium content, and up to 100% oxygen for decompression diving.

This program is designed as a stand-alone course, or it may be taught in conjunction with TDI Advanced Nitrox at the discretion of the instructor.