The Tec 40 subcourse of the DSAT Tec Diver course is a limited, entry-level technical diving program that bridges the gap between recreational diving and full technical deep decompression diving. Certified Tec 40 divers are qualified to make limited decompression dives using equipment that is marginally more extensive than that used in mainstream recreational diving.

The Tec 40 course consists of three knowledge development sections, three practical applications sessions and four training dives.

Participant prerequisites: Certified as a PADI Advanced Open Water Diver (or a qualifying certification from another training organization), PADI Enriched Air Diver (or a qualifying certification from another training organization), PADI Deep Diver or proof of 10 dives to 30 metres/100 feet, 18 years old, 30 logged dives (10 with EANx, 7 deeper than 30 metres/100 feet).