Scuba certification levels, explained
Updated 2026-06-30 · Certification
Recreational scuba certifications form a ladder. You start with Open Water (the entry-level card that lets you dive to 18 m / 60 ft), then add training as you want to go deeper, handle more, or turn pro. Each level builds on the last, and alongside them sit specialty courses like Nitrox or Deep that add a specific skill.
You never have to climb the whole ladder — most divers are perfectly happy at Open Water or Advanced. But knowing the path helps you see where your first certification leads.
The core ladder
The main recreational progression looks like this:
- ·Open Water: the entry-level certification — dive to 18 m / 60 ft with a buddy.
- ·Advanced Open Water: more experience across dive types; extends your limit to around 30 m / 100 ft.
- ·Rescue Diver: learn to prevent and manage diving emergencies — widely seen as the most rewarding course.
- ·Divemaster & Instructor: the professional levels, where you can guide or teach.
Specialties sit alongside
Specialty courses add a focused skill rather than a rung: Enriched Air (Nitrox) for longer no-stop times, Deep to reach the 40 m recreational maximum, plus Wreck, Night, Navigation, Drysuit and more. You can take many of them once you hold Open Water.
Where should you start?
Everyone starts at Open Water — it's the foundation the entire ladder is built on, and the one with the written theory exam most beginners want help with. Get comfortable there first; the rest of the ladder is optional and waits for you whenever you're ready.
Frequently asked questions
What is the first scuba certification?+
Open Water Diver is the entry-level certification. It teaches the core theory and skills and certifies you to dive to 18 m (60 ft) with a buddy, anywhere in the world.
Do I need Advanced Open Water?+
Not necessarily. Many divers stay at Open Water and dive happily for years. Advanced is worth it if you want to go deeper (to ~30 m), build confidence faster, or try specialties like deep and night diving.
What is the highest recreational certification?+
Rescue Diver is typically the highest core recreational course before the professional levels (Divemaster and Instructor). Beyond Rescue, certifications become professional or technical.