Open-water scuba to 18–40 m — PADI, SSI and the difference between a holiday course and a craft. 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.
Check each criteria to confirm findings against the atlas verdict.
Open-water scuba to 18–40 m — PADI, SSI and the difference between a holiday course and a craft. 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. Many Open Water cards are written to 18 m. Further training raises that toward 30–40 m inside recreational no-stop diving.
Emile Gagnan and Jacques Cousteau’s 1943 demand regulator is the usual origin of open-circuit scuba. Military and working divers used rebreathers and helmets first. Recreational scuba begins when the Aqua-Lung and later storefront agencies made a holiday course possible.
This is a reading check for the atlas, not personal advice, a live price, or a booking. It does not replace the full topic page.
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🔎 Caribbean: read “Belize park” before you decide · 🛑 Caribbean: what “Bonaire park” does not decide · 📍 Competitive swimming: the local fact in “Tech-suit era” · 🔎 Freedive safety: read “Rescue” before you decide · 🛑 Freedive safety: what “This page” does not decide · 📍 Freediving: the local fact in “Rec depths” · Decision checks