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TDI Semi-Closed Rebreather Instructor Course

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Course Overview

This is the entry-level certification course for recreational instructors wishing to teach the Dolphin or Ray semi-closed rebreather. The objective of this course is to train instructors in the benefits, hazards, and proper procedures for using Semi-Closed Rebreathers.


Minumum age of 18.
Semi-Closed Rebreather certified.
Nitrox Instructor certified.
Proof of 10 logged Semi-Closed Rebreather dives.

Details of the course

The Semi-Closed Rebreather instructor course covers:

  • History and evolution of rebreathers
  • Comparison of Open Circuit, Semi-Closed Circuit and Closed Circuit
  • Practical mechanics of the system
  • Review of Nitrox
  • Physiology
  • Formula work, metabolic consumption
  • Dive tables & dive computers
  • Problem solving
  • Dive planning

Course duration and number of dives

The Semi Closed Rebreather instructor course is a 3 day course and 4 dives are required.

Course Price

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Additional costs

Recreational Rental equipment if needed. set p/day
TDI Semi-Closed Diver Manual
Specific Manufacturer rebreather manual
TDI Semi-Closed Instructor Manual
TDI Standards & Procedures Instructor Manual
TDI Evaluation forms

Equipment requirement

The Semi-Closed Rebreather instructor course has no specific equipment requirement more than your standard recreational dive gear. We supply the unit, dive sorbe, nitrox tanks and mixes, and the oxygen analyser.

Got something to ask us ?

We are Technical diving education professionals and over the years we have been asked almost everything, feel free to look at our most commonly asked technical diving questions or contact us directly.