The IANTD Normoxic Trimix Diver program is designed to train divers who wish to dive to depths between 39 and 60 msw (130 and 200 fsw), but do not wish to breathe air below 39 msw (130 fsw).This program qualifies divers to perform Trimix dives to a maximum depth of 60 msw (200 fsw) using custom bottom mixes with a minimum oxygen content of 19% and one decompression cylinder.