50m
10m - 30m
Boat
Advanced
50m
10m - 30m
Boat
Advanced
Other, Deep, Wall
Boat
50m
10m – 30m
Advanced
21% – 23%
O213% at 48m / 24%
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Gradual Narcosis Onset — Narcosis may develop slowly, making self-assessment unreliable.
Task Fixation at Depth — Cognitive narrowing at depth can reduce awareness of time and ascent rate.
Increased Gas Density Breathing Load — Higher gas density at depth increases work of breathing.
Unstable Visual Ascents — Relying on wall visuals can destabilise ascents.
Gradual Depth Creep — Lack of visual bottom reference can cause unnoticed descent.
Unsignalled Downcurrents — Downcurrents can form without visible indicators.