TDI Extended Range

TDI Extended Range

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 can expect to learn

History of deep air diving

SPhysics

Physiology

Decompression Options

Equipment considerations

Dive tables

Dive planning

Diving procedures

Descent considerations

Ascent considerations

Technical dive support

Navigation

Some of the required skills you will have to demonstrate:

Land Drills-Demonstrate familiarity with basic and intermediate hand signals

Land Drills-Selection and preparation of equipment suitable for soft overhead<br /> environment with long decompression obligations

Land Drills-Conduct team oriented drills for lift bag deployment and gas switching<br /> procedure

Land Drills-Drills for buddy rescue

Land Drills-Drills for toxed diver / unconscious diver ascent

Land Drills-Properly analyze all gas mixtures to be used

Land Drills-Demonstrate adequate pre-dive planning

Pre-dive Drills-Use START* before every dive

Pre-dive Drills-Stress analysis and mitigation

Pre-dive Drills-Gas matching among buddy team

In-water Drills-Demonstrate buoyancy control; ability to hover at fixed position in water column without moving hands or feet

In-water Drills-Show good awareness of buddy and other team members through communications, proximity and team oriented dive practices

In-water Drills-Demonstrate competence managing 2 stage cylinders, either 2 deco gas or 1 deco and extra bottom gas, including drop and recovery while maintaining position in the water column

In-water Drills-Demonstrate ability to confirm gas switches at depth with buddy/team members

In-water Drills-Demonstrate lift bag deployment from depth and use of bag as back-up buoyancy device

In-water Drills-Demonstrate air-sharing ascent from depth while one member of buddy team is without mask, both as a donor and recipient

In-water Drills-Create contingency decompression schedule after simulated loss of decompression gas

In-water Drills-Remove and replace mask, deploy back up mask

In-water Drills-Demonstrate tired diver tow at depth and on surface; 30 metres / 100 feet lateral

In-water Drills-Complete a horizontal breath-hold swim at depth for 15 metres / 50 feet with mask off or blacked out

In-water Drills-Properly execute the planned dive within all pre-determined limits

In-water Drills-Demonstrate the proper procedures for switching and isolating a<br /> malfunctioning regulator. This skill is to be performed at a depth no deeper than 40 metres / 130 feet

In-water Drills-Demonstrate the proper navigational techniques for the specific dive

In-water Drills-During 2 dives, demonstrate an ascent with ascent reel and lift bag and perform staged decompression

In-water Drills-During 1 of the dives, tow a simulated unconscious diver, while at depth, 9 metres / 30 feet to ascent line and simulate an emergency rescue ascent technique

Course prerequisites:

Minimum age 18

Certified as a TDI Advanced Nitrox Diver and TDI Decompression<br /> Procedures Diver, or equivalents

Provide proof of a minimum of 100 logged dives, of which 25 must be deeper than 30 metres / 100 feet

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TDI Extended Range