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By the time you've done the decompression procedures course, you will be conversant with the methods and procedures associated with decompression diving using hyperoxic mixtures. Progressing beyond this means going deeper than 45m, staying at the bottom for longer, or both. Extended range takes you to the limit of using air as a bottom gas; 55m. Beyond this, gas narcosis becomes increasingly dangerous. At 6.5 atmospheres, increased gas consumption and inert gas tissue loading necessitates using additional decompression gases, and performing longer decompression stops than deco diving to 45m.

A big part of the extended range course is focussed on narcosis management. The difference between the effects of gas narcosis at 45m and 55m can be considerable, so exposure during the course is fundamental. Moreover, risk management is also discussed, and task loading increased during the training dives to ensure that, in the event of a problem at any point on an extended range dive, you are able to deal with any issue comfortably.

Although extended range is a good alternative for divers that are put off by the prohibitive cost of using helium on deeper dives, carrying, and using additional decompression cylinders also prepares you for the TDI trimix course. 

Items covered during the course include:

  • Equipment requirements and configuration
  • Decompression options
  • Emergency planning and procedures
  • Requirements for dive planning
  • Buddy rescue
  • Narcosis management

Course Details:

  • 3 days
  • 4 open water dives
  • Max depth to 55m

Course Fees:

  • Extended Range 25,000 Thai Baht
  • (All course fees and materials included with no hidden extras).


  • 18 years of age or older
  • Decompression Procedures diver
  • Proof of at least 100 logged dives, 25 of which must be deeper than 30m

Certification Options:

  • TDI

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