All PADI certifications explained: from beginner to Divemaster

PADI is the world's largest recreational diving training organisation, with over 29 million certifications issued since 1966. If you are considering getting into scuba diving, or if you already hold a certification and want to know what comes next, this guide breaks down every PADI level from your very first breath underwater all the way to the professional Divemaster rating. No marketing fluff, just clear facts about depth limits, duration, prerequisites and realistic costs.

What is Discover Scuba Diving and who is it for?

Discover Scuba Diving (DSD) is not a certification. It is a supervised introductory experience for people who want to try scuba diving without committing to a full course. There is no exam, no theory and no prerequisite other than being at least 8 years old and in reasonable health.

During a DSD, you learn the absolute essentials: how to breathe through a regulator, how to equalise your ears, and basic underwater communication. Then you dive with an instructor at a maximum depth of 12 metres. The whole experience takes 2 to 3 hours. Typical cost: 50 to 120 euros, equipment included. For the full breakdown, read our complete Discover Scuba Diving guide.

Best for: absolute beginners, people unsure if they will enjoy diving, holiday activities, gifts. If you love it, skills from your DSD can count towards the Open Water course.

What does the PADI Scuba Diver certification include?

The PADI Scuba Diver is a lesser-known certification that sits between the DSD and the Open Water. It is essentially the first half of the Open Water course. You complete the first three chapters of theory, two confined water sessions and two open water dives.

The certification allows you to dive to a maximum depth of 12 metres, but only under the supervision of a PADI professional (Divemaster or instructor). You cannot dive independently with a buddy, which is the main limitation compared to the full Open Water.

Duration: 1 to 2 days. Maximum depth: 12 metres (supervised only). Minimum age: 10 years. Cost: typically 200 to 350 euros.

Best for: people with limited time who still want a recognised certification. The credit transfers directly to the Open Water, so you can upgrade later without repeating anything.

What does the PADI Open Water Diver course cover?

The Open Water Diver is the most popular diving certification in the world. It is your passport to independent diving down to 18 metres with a certified buddy, at any dive centre on the planet, for life.

The course consists of three parts. First, theory: you complete the PADI eLearning from home (roughly 10 to 15 hours of self-study covering dive physics, physiology, equipment, planning and environment). Second, confined water sessions: 5 modules practised in a pool or shallow protected area where you master essential skills such as mask clearing, buoyancy control, regulator recovery and emergency procedures. Third, open water dives: 4 dives in the sea where you apply everything in real conditions.

Duration: 3 to 4 days on site (eLearning completed before arrival). Maximum depth: 18 metres. Minimum age: 10 years (Junior OW for ages 10-14, limited to 12m with a certified adult). Cost: 300 to 600 euros depending on destination, excluding eLearning.

Best for: anyone serious about diving. This is the certification that opens every door. For a deeper comparison with the next level, see our Open Water vs Advanced article.

What does the Advanced Open Water Diver unlock?

The Advanced Open Water is the natural next step after the OW, and it is often where diving becomes genuinely addictive. The course consists of 5 adventure dives spread over 2 to 3 days, each focused on a different specialty. Two dives are mandatory: Deep Dive (to 30 metres) and Underwater Navigation. You choose the other three from a menu that typically includes night diving, wreck exploration, peak performance buoyancy, naturalist and underwater photography.

There is no formal theory exam. Learning happens in the water, with thorough briefings before each dive and debriefs after. It is very hands-on and, frankly, the most enjoyable course in the PADI system. Many divers complete it immediately after their Open Water during the same trip.

Duration: 2 to 3 days. Maximum depth: 30 metres. Prerequisite: Open Water certification. Minimum age: 12 years (Junior AOW for 12-14, limited to 21m). Cost: 300 to 500 euros.

Best for: any Open Water diver who wants to go deeper, explore more, and access the world's best dive sites which are often below 18 metres.

What makes the Rescue Diver course different?

The Rescue Diver is widely regarded as the most challenging and most rewarding course in the PADI recreational pathway. It shifts your mindset from "me as a diver" to "me as someone who can help others." You learn to recognise and manage stress in yourself and other divers, respond to emergencies at the surface and at depth, search for missing divers, and perform in-water rescue breathing.

The course involves realistic scenario-based training. You do not just learn theory; you practise pulling an unconscious diver to the surface, managing a panicked buddy, and coordinating emergency response. It is physically demanding but not extreme.

Duration: 3 to 4 days. Prerequisites: Advanced Open Water + current Emergency First Response (EFR) certification. Minimum age: 12 years. Cost: 350 to 600 euros.

Best for: any diver who wants to be genuinely safer and more competent in the water, and the mandatory stepping stone to the Divemaster.

What is the PADI Divemaster and is it worth it?

The Divemaster is the first professional level in the PADI system. It takes you from recreational diver to dive professional. You learn to lead certified divers, assist instructors during courses, conduct Discover Scuba Diving experiences and manage dive operations. It is a 2 to 4 week intensive programme that covers advanced theory, water fitness assessments, skill demonstrations at instructor level, and extensive practical training with real students.

The requirements are significant: Rescue Diver certification, minimum 40 logged dives to start (60 to be certified), current EFR, medical clearance, and minimum age of 18. The course typically costs between 1,000 and 2,500 euros depending on the location and what is included.

Once certified, you can work at dive centres worldwide, lead dives, assist courses and build your career in the diving industry. For the full picture on what the Divemaster involves and why it changes everything, read our dedicated article: Why become a Divemaster?

What about PADI specialties?

Alongside the main certification pathway, PADI offers over 30 specialty courses that let you develop specific skills. Each specialty typically involves 2 to 4 dives and focuses on one topic. Popular specialties include:

• Deep Diver: extends your depth limit to 40 metres. Requires Advanced OW.
• Enriched Air (Nitrox): teaches you to dive with oxygen-enriched air for longer bottom times and shorter surface intervals. One of the most useful specialties.
• Wreck Diver: safe exploration of shipwrecks, including penetration techniques.
• Night Diver: torch techniques, navigation in the dark and the incredible nocturnal marine life. See our night diving guide.
• Peak Performance Buoyancy: the single best specialty for improving your overall diving. See our buoyancy tips article.
• Self-Reliant Diver: solo diving techniques for very experienced divers (100+ logged dives, Rescue Diver prerequisite).
• Dry Suit Diver: essential for cold-water diving in Belgium and Northern Europe.

Collecting 5 specialties plus your Advanced and Rescue earns you the PADI Master Scuba Diver rating, the highest non-professional level.

How do the certifications compare at a glance?

Here is a quick reference comparing the key facts for each level:

• DSD: 0 prerequisites, 12m max, 2-3 hours, no certification issued, 50-120 euros.
• Scuba Diver: age 10+, 12m (supervised), 1-2 days, 200-350 euros.
• Open Water: age 10+, 18m, 3-4 days, 300-600 euros.
• Advanced OW: OW required, age 12+, 30m, 2-3 days, 300-500 euros.
• Rescue Diver: AOW + EFR, age 12+, safety focus, 3-4 days, 350-600 euros.
• Divemaster: Rescue + 40 dives + EFR, age 18+, professional level, 2-4 weeks, 1000-2500 euros.

All certifications are valid for life and recognised worldwide. There is no expiry date, though it is strongly recommended to do a refresher dive if you have not been in the water for more than 12 months.

The bottom line

The PADI certification system is designed as a logical progression. Each level builds on the previous one, adding depth (literally and figuratively), skills and confidence. You do not need to rush through them. Some divers take years to go from Open Water to Divemaster. Others do it in months. There is no wrong pace.

What matters is choosing an instructor who adapts to you, keeps groups small and prioritises your learning over the schedule. That is exactly what we do at Dive With Lau: personalised coaching, small groups, and the flexibility to learn at your own rhythm.

Ready to start or continue your certification journey? Contact Lau to discuss which course is right for you. We offer all PADI levels from DSD to Divemaster in Tenerife, Malaga and Greece.