Access
A referral or full Open Water course, then a park ticket or boat. Many countries require a licensed centre.
Recreational scuba is open-circuit diving within sport limits: usually 18 m on a first qualification, up to about 40 m with further training, no-stop profiles, and a buddy. PADI (1966) and SSI (1970) sell the mass courses; agencies do not own the ocean.
Gear load and wow factor sit high in this atlas. Accessibility is middling because a course, a medical screen and a boat day stand between a swimmer and a reef. Risk is real and still lower than wreck penetration or night in a current.
This chapter is not a certifying agency, not medical advice, and not a dive briefing. Tables, computers and the day’s conditions belong to a living instructor and a local operator.
Local notes
Season
Monsoon, wind and plankton blooms close pretty days. Operators cancel; blogs do not.
Agencies
PADI, SSI, NAUI, RAID and CMAS federations. Cards are training records, not permits to ignore a ranger.
Typical limit18–40 m rec.
AgenciesPADI, SSI, others
Buddy systemDefault model
GasOpen-circuit air/Nitrox
OW coursePool + 4 dives typ.
Not this pageA live briefing
Profile
Accessibility
44
Skill ceiling
66
Gear load
80
Risk
58
Seasonality
46
Wow factor
82
Seven chapters
Origins
From Cousteau–Gagnan to PADI’s mass course.
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How
Confined water, four ocean dives, then a conservative first year.
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Gear
The heaviest bag in this atlas — and what can be rented.
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Safety
Pressure, panic and the buddy — not a briefing.
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Points
Eight famous sport-diving waters.
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Culture
Agencies, liveaboards, and the logbook.
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Today
More cards, hotter reefs, smarter computers.
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Frequently asked questions
Is this site a certifying agency?
No. Tool-Lifes publishes an atlas. PADI, SSI and others issue cards after courses they control.
What is a typical first depth limit?
Many Open Water cards are written to 18 m. Further training raises that toward 30–40 m inside recreational no-stop diving.
Who invented the Aqua-Lung?
Emile Gagnan and Jacques Cousteau’s 1943 demand regulator is the usual origin of open-circuit scuba.
Is Nitrox required?
No. Enriched air is a common extra course. Air remains the default.
Can people stop after a course?
Yes. Skills decay. A checkout after a layoff is normal.
What does recreational exclude?
Planned decompression, overhead wreck or cave penetration, and untrained solo diving.
Is a computer enough?
A computer is a tool. A gas plan and a buddy remain the culture of a conservative dive.
Medical advice?
No. Fitness to dive is a clinician and agency-form question.