Open Water Diver

Open Water Diver is the entry-level scuba certification. PADI and SSI both run it, and millions of people start here. You learn to breathe underwater on purpose, handle the kit without panicking, and dive with a buddy to 18 metres in conditions similar to your training.

No prior diving experience is needed. You do need basic water comfort: a short swim and a float, which your centre checks before you get serious in the water. Theory comes first (often online), then shallow pool or confined sessions where you repeat skills until they feel boring. That is the point. Four open water dives follow, usually over two days, and the certification is yours for life.

PADI and SSI follow the same broad ISO recreational standard, so either card works worldwide. The difference is mostly packaging. PADI eLearning is the familiar route. SSI digital training is flexible, and some centres let you sample an open water dive early. Compare courses on adventuro and pick a centre that suits your diary, holiday plans, or local quarry habit.

Syllabus

What is enables

Prerequisites

Duration

Assessment

Phase 1 — Knowledge development: Dive physics and pressure effects. How lungs, ears and sinuses respond underwater. Equipment: regulator, BCD, weights, cylinder, exposure protection. Dive planning: depth, time, no-decompression limits, tables or a dive computer. Buddy procedures, hand signals and controlled ascent rates. Environmental awareness and responsible diving. PADI covers this through eLearning, the Touch app, or manual plus video, with instructor reviews. SSI uses structured academic sessions with section assessments and a final exam.
Phase 2 — Confined water skills: Kit assembly and pre-dive safety checks (BWRAF). Regulator use, recovery and clearing. Mask partial and full flood clearing. Buoyancy control: fin pivot, hover, proper weighting. Most new divers start overweighted. Your instructor will peel lead off until you stop sinking. Alternate air source use from a buddy. Controlled emergency swimming ascent. Out-of-air procedures. Surface skills including cramp removal, tired diver tow, snorkel and regulator exchanges, emergency weight drop and inflatable signal tube use where your agency includes them in the course.
Phase 3 — Open water dives (four dives): Apply confined-water skills in a lake, quarry or sea site under instructor supervision. PADI structures four dives over usually two days, with flexible surface skills spread across dives 1 to 4. Training dives 1 and 2 typically stay shallower. Dives 3 and 4 may reach 18 metres. SSI limits open water dives 1 and 2 to 12 metres and later dives to 18 metres (10 to 11 year olds: 12 metres maximum throughout). Each dive includes planning, entry, skill practice, exploration time and a controlled ascent.
SSI note: SSI allows Open Water Training Dive 1 before all academic work is complete (as a Basic Diver taster). Dive 2 only happens after academic sessions 1 to 3 and confined sessions 2 to 3 are complete.
PADI note: Referral programmes let you complete knowledge and confined water at home, then finish the four open water dives with another PADI centre abroad.

Dive with a certified buddy, without instructor supervision, to a maximum depth of 18 metres (60 feet) once you have completed all four open water training dives to the required standard.
Dive in environments and conditions equivalent to your training (both agencies phrase it this way). Stay within your training and comfort until you build experience.
Rent scuba equipment, obtain air fills and book boat dives at participating centres worldwide. Your certification card (physical or digital) is your proof of training.
Progress to Advanced Open Water or specialty courses (deep, navigation, drysuit, nitrox and others) as your next steps.
Junior divers (under 15): Depth and supervision rules apply until you upgrade. PADI Junior Open Water Divers aged 10 to 11 may dive to 12 metres with a parent, guardian or PADI Professional. Ages 12 to 14 may dive to 18 metres with a certified adult. SSI Junior Open Water Divers follow the same 12 metre limit for ages 10 to 11 and 18 metres for ages 12 to 14, with direct supervision from a dive professional or certified adult.

Age: 10 years or older with both PADI and SSI. Divers aged 10 to 14 receive a junior certification with depth and supervision limits until they upgrade at 15 (PADI Junior Open Water Diver; SSI Junior Open Water Diver).
Health: Good general health, especially breathing and circulation. Complete a diver medical questionnaire before in-water training. Some conditions need physician sign-off.
Swimming: Water skills assessment before open water dives. PADI requires a 200 metre swim or 300 metres in mask, fins and snorkel, plus 10 minutes floating or treading water, with no time limit. SSI requires the Student Water Fitness Evaluation from its general training standards (similar swim and float requirements; your centre confirms the exact format).
Experience: None. This is the first scuba course.

Most people finish in three to four days, though centres offer weekend blocks, evening pools, or holiday intensives that spread it wider.Knowledge development: Often completed at home via PADI eLearning or SSI digital training before you meet your instructor. Classroom sessions remain an option where online study is not used.Confined water: PADI specifies five confined water dives. SSI uses pool or confined-water sessions per its instructor manual. These build kit handling, buoyancy and emergency drills in pool-like conditions (SSI confined water depth limit: 5 metres).Open water: Four training dives with both agencies, typically over at least two days. PADI allows referral between centres if you start at home and finish on holiday.

Both PADI and SSI use performance-based assessment. You earn certification by demonstrating skills, not by simply attending sessions.

Theory: PADI uses knowledge reviews, quizzes and a final exam or eLearning Quick Review with your instructor. SSI requires completion of all academic sections plus an Open Water Diver final exam before certification is issued.
Water fitness: Swim and float test before open water training (see prerequisites).
Confined water: You must show each required skill to your instructor's satisfaction. Extra pool time is normal if something needs more practice.
Open water: Four dives where you repeat core skills in real conditions. Your instructor evaluates buoyancy, awareness, emergency responses and dive planning. SSI additionally requires all skill evaluations from its instructor manual at professional standard under direct supervision.
Medical: A completed diver medical form is required before in-water training with both agencies.

Certification FAQs

If you have any further questions about the qualifications we would be happy to help, just ask in the live chat below

What is the difference between PADI and SSI Open Water Diver?

Both certify you to dive with a buddy to 18 metres in conditions similar to your training, and both align with ISO recreational diver training standards. The syllabus is largely the same: theory, confined water skills, four open water dives.

PADI is the larger agency globally. Its eLearning is well known, and referral lets you finish open water dives at a different centre on holiday. SSI leans on digital training through MySSI, and its standards allow a taster open water dive before all theory is complete. Some people prefer SSI's app-led flow; others like PADI's shop network. Either card is accepted at reputable centres worldwide. Pick the instructor and schedule, not just the logo.

Do I need to be a strong swimmer?

You do not need to be fast. You do need to be comfortable in water.

PADI asks for a 200 metre swim or 300 metres in mask, fins and snorkel, plus 10 minutes floating or treading water. No time limit, any stroke. SSI uses its Student Water Fitness Evaluation before open water dives, which covers similar ground. This is not about athleticism. It is about proving you can handle yourself if something goes wrong at the surface. Your centre runs the check early so you know where you stand.

How deep can I dive after certification?

18 metres (60 feet) with a certified buddy, in environments equivalent to your training. That is the recreational entry-level limit for both agencies once you have passed all four open water dives.

During training, depths build gradually. SSI caps dives 1 and 2 at 12 metres. PADI typically keeps early dives shallower before dives 3 and 4 reach 18 metres. Junior divers aged 10 to 11 are limited to 12 metres with supervision. Ages 12 to 14 may train to 18 metres but dive with a certified adult or professional until they upgrade at 15.

How long does the course take?

Three to four days is typical if you run it back to back: theory (often done at home first), confined water sessions, then four open water dives over at least two days.

Weekend warriors and holidaymakers spread it over longer. PADI eLearning and SSI digital training let you front-load theory so pool and sea days are mostly diving. Weather, travel and your own pace can add time. Mask clearing in particular has ruined many a tidy schedule. Instructors would rather you repeat a skill than rush it.

Is the course safe for complete beginners?

Yes, when taught by a qualified instructor to agency standards. You start in shallow, controlled water. Skills are introduced step by step and repeated until they are automatic. Emergency procedures are drilled before you need them.

You complete a medical questionnaire before getting wet. Be honest on the form. Some conditions need a doctor's sign-off, and that is there to protect you, not to catch you out. Everyone in the water was a nervous beginner once, including your instructor.

What is included in the course fee?

It varies by centre. Instruction, certification fees and course materials are usually in the bundle. Equipment hire is often included for training dives but not always.

PADI eLearning or SSI digital training may be a separate purchase or bundled in. Transport to dive sites, logbooks and personal kit (mask, snorkel, fins) are common extras. Adventuro listings spell out what each centre includes. Ask before you pay if anything is unclear.

Can I do the course on holiday?

Very common. Warm water, good visibility and a week off work is a fine way to learn.

PADI's referral route lets you do theory and pool at home, then finish the four open water dives abroad with another PADI centre. SSI centres abroad can pick up your digital training record through MySSI. Allow slack in the schedule for weather and skill repeats. Do not book your flight home the morning after your last scheduled dive.

Is there an exam?

Yes on theory. PADI uses knowledge reviews, quizzes and a final exam or eLearning Quick Review with your instructor. SSI requires section assessments throughout the academics plus an Open Water Diver final exam.

The in-water side is practical assessment, not a written test. You demonstrate skills in confined water, then repeat the important ones in open water. Fail is the wrong word. You practice until you meet the standard. That can mean extra pool time, and that is normal.

What if I struggle with a skill?

Mask clearing trips up almost everyone at least once. Buoyancy takes a few dives to click. Instructors expect it and build time for repeats.

Extra confined water sessions are available at most centres if you need them. There is no shame in asking for another go in the pool before heading to open water. The goal is competence, not keeping to a timetable. You will get there.

What equipment do I need?

Training centres usually provide the heavy kit: cylinder, regulator, BCD and weights for course dives. Many include a full hire package.

A mask that fits your face, snorkel and fins are worth owning early. Ill-fitting rental masks cause more misery than any skill drill. Exposure protection (wetsuit or drysuit) depends on water temperature. Your centre advises on what they provide and what to buy. Logbook and dive computer may come later. For the course, your instructor lists the essentials.

What is junior Open Water certification?

Divers aged 10 to 14 earn a junior card with depth and supervision limits. At 15 you can upgrade to a full Open Water Diver certification without retaking the whole course.

Ages 10 to 11: maximum 12 metres, with a parent, guardian, dive professional or certified adult (agency rules differ slightly on who must be in the water). Ages 12 to 14: may dive to 18 metres with appropriate supervision. Junior programmes follow the same training structure as adults, with smaller groups and extra attention where needed.

Can I start the theory online?

Yes. PADI Open Water Diver eLearning and SSI digital training both let you study at home before the wet sessions. You work through videos, knowledge reviews and quizzes at your own pace, then meet your instructor for the in-water phases.

Starting online saves holiday days for actual diving. Your centre links your digital record when you enrol. Bring your eLearning completion record or MySSI login to your first pool session.