Enriched Air and Nitrox

The Nitrox specialty at PTC is listed at $100 and is available as a standalone course or as part of the Open Water + Nitrox combo ($295). That combo is worth noting — pairing the two means a newly certified diver can immediately start using enriched air, which extends bottom time and reduces nitrogen loading on multi-dive days.

The course qualifies for GI Bill® reimbursement, which is relevant for veterans working through a certification pathway at PTC. It's also one of the more practical specialties to stack early, especially if the next step after Open Water is a dive trip somewhere you'll be doing multiple dives per day.

PTC stocks nitrox fills on-site, so the certification has immediate practical use within the center's own service offering. You don't need to go elsewhere to put the card to work.