150m
8m - 23m
Boat
Experienced
150m
8m - 23m
Boat
Experienced
Night, Muck, Drop Off, Deep, Wall, Inland
Boat
150m
8m – 23m
Experienced
—
-1% at 148m / 21%
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Landmark Misidentification — Familiar sites can become unrecognisable at night.
Light-Induced Tunnel Vision — Focused light beams reduce peripheral awareness.
Depth Perception Errors — Reduced ambient light increases depth perception mistakes.
Navigation Ambiguity — Lack of reference points makes exits harder to relocate.
Unnoticed Depth Drift — Featureless terrain can cause slow, unnoticed depth changes.
Camouflaged Hazardous Species — Hazardous marine life may remain unnoticed until very close.
Edge-Accelerated Currents — Currents often strengthen along drop-off edges.
Depth Perception Distortion — Visual contrast can distort perceived depth.
Terrain-Induced Descent — Divers may unintentionally follow terrain downward.
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.
Thermocline Buoyancy Shift — Sharp thermoclines can cause sudden buoyancy changes.
Instant Visibility Collapse — Sediment disturbance can eliminate visibility immediately.
Late Detection of Structures — Submerged structures may only appear at very close range.
