Formation de Sidemount TDI

TDI Advanced Trimix at Nepteau is the top of the technical gas-diving ladder the centre offers — helium-oxygen mixes for dives to 100 metres. The course covers planning and execution of trimix dives, managing multiple gas switches, narcosis reduction at depth, and the physiological considerations of breathing helium at pressure.

This course can be taken as a standalone programme or paired with the TDI Trimix Diver course. At a centre that also trains on the Hammerhead closed-circuit rebreather and runs IANTD courses, students reaching this level are in a facility where the infrastructure — gas fills, instructor experience, equipment knowledge — matches the demands of the training.

The Neptopedia encyclopaedia on their site covers technical concepts including drysuit physics, regulator mechanics, cylinder specifications and console reading — it's a reference library that reflects the depth of knowledge the Nepteau team brings to this end of the course catalogue.