tech specialists

technical diving in phuket

tech diving international


tda cmas logo

dsat tech rec

Closed-Cicuit Rebreather Air Diluent (MOD1) Course Details

courses > rebreather > closed-circuit rebreather air diluent (mod1)

Certification available through

Course Overview

The Closed-Circuit Rebreather Air Diluent (MOD1) course is the first step in the exclusive world of closed-circuit rebreathers. The main focus of this course is learning the benefits and hazards of closed rebreathers and understanding the concept of a constant Po2.


Nitrox diver certified.
20 logged dives.


After completing the Closed-Circuit rebreather Air Diluent (MOD1) course, the successful candidate engage in non decompression diving using air as a diluent on a specific closed-circuit rebreathers to a maximum depth of 30msw.

Combination courses

You can combine the Closed-Circuit rebreather Air Diluent (MOD1) course with:

  1. Advanced Nitrox Diver course.

What can I do next?

Once certified as a Closed-circuit rebreather Air Diluent (MOD1) diver you can enroll in:
  1. Closed-circuit rebreather Air Diluent - Decompression (MOD2) course.

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.