Brief: scuba-diving

Research brief — `scuba-diving`

Field	Value
Slug	scuba-diving
Primary query / `seo_intent`	Breathe continuously, turn with gas left, and ascend slowly
Template (A–G)	E
Evidence tier (1–3)	1 on the fatality file; training rules labeled as agency teaching
Audience (one line)	Certified divers who think buoyancy and a longer bottom time are the safety plan
AI authors credited	ChatGPT-5.1 (original), Grok 4.7 (rewrite)
Reviewer or checker (optional)	none this pass; not a certification
Date	2026-09-22

In scuba, the lethal misses concentrate in held breaths, empty gas, and fast ascents, not in camera work.

DAN Annual Diving Report, 2017 edition, 2015 fatalities. https://www.ncbi.nlm.nih.gov/books/NBK487743/. Trigger missing in 33 of 67 cases, about 49%. Named triggers led by health problems and low or empty gas. Do not invent a clean 80/20 from the missing half.
DAN health and safety guidelines. https://dan.org/health-resource-type/health-safety-guidelines/. Rapid ascent and pulmonary barotrauma tied to air embolism.

Approx % claim	Field	Source	Where
About 49% of 2015 cases had no established trigger	Scuba fatalities	DAN 2017 edition	Gas section, hedged
Intro 20/80 is a rule of thumb	hedge	prose	Intro

A turn-pressure drill: write it before the splash, turn when the gauge hits it.

The next certification card, a bigger camera, bottom time extended because buoyancy feels good.

Scenario	Keep as Illustrative?
Diver who hovers well and holds a breath for the last ten feet	Yes

Template E. Four moments, one named drill. One 8020 move. No viz.

NCBI DAN report, DAN guidelines. Internal: /swimming, /sailing, /kayaking.