The SDI Computer Nitrox course is the most popular specialty scuba course. Why? Because scuba diving with enriched air nitrox gives you more no decompression time, especially on repetitive scuba dives. If staying down longer and getting back in the water sooner sounds appealing, then don’t hesitate to become an enriched air diver. The Enriched Air course is conducted upon request as a personalised 1/2 day theory only course.