What the actual risks are — and what training mitigates
The four mechanism types behind dive incidents, in order of frequency: (1) cardiovascular events — pre-existing conditions exacerbated by exertion; mitigated by an honest medical questionnaire before certification, (2) drowning — usually triggered by panic; mitigated by buoyancy training and the "stop, breathe, think, act" reflex drilled into Open Water, (3) decompression illness — from breaking ascent rules; mitigated by dive computers and conservative profile planning, (4) arterial gas embolism — from holding your breath on ascent; the first rule every diver learns is "never hold your breath".
Why Gili Air is statistically safer than many other Indonesia sites
Three structural factors: shallow training depths — 12 m for Basic Diver, 18 m for Open Water, so no decompression-stop risk at any time during training, mild currents — Gili reefs have current ranges of 1-3 (on a 1-5 scale) on most sites, vs Komodo or Penida where 4-5 is common, and short boat distances — every site is 5–15 minutes from shore, so emergency surface support is always close. We carry oxygen and an AED on every boat; nearest decompression chamber is in Bali (90 minutes by fast boat + helicopter). Documented in our standard operating procedures.