With DSAT, if you omit decompression from deeper than 20 feet, return to the first stop depth as quickly as possible (ideally less than five minutes) and decompress according to schedule up to and including the 40 foot stop. Extend the 30 foot stop and all shallower stops by 1.5 times their scheduled times.
For more information look into getting the Tec Deep Diver Manual.
For more information look into getting the Tec Deep Diver Manual.