Enriched Air Diver Specialty Diving with enriched air nitrox lets you safely extend your no stop time beyond the no decompression limits for air. Diving with enriched air means more time.  Must be a PADI Open Water Diver  Learn to analyze cylinder contents.  Plan enriched air dives using tables and dive computers.  Safely increase your no stop time.  Certification counts toward the Master Scuba Diver rating.  Classroom based - Half day