Grotto de la Troisieme

South Province, New Caledonia

Depth

Visibility

25m - 75m

Entry

Shore

Experience Level

Advanced

Grotto de la Troisieme

South Province, New Caledonia

Depth

Visibility

25m - 75m

Entry

Shore

Experience Level

Advanced

About Grotto de la Troisieme

Known as 3rd Cave or Devils Grotto this is a cave dive for the logbooks! Its in the middle of a forest creating a green roof that almost obscures its entrance entirely. Once you are in it drops steeply to 30 m along slippery rock until you surface at a pool below ground. The air is a bit stagnant but pleasant and cool after the mission through the dense jungle to get there. The cave has thousand year old stalagmites and stalactites When you are inside the structure you can see a light if you turn off the torches.

Grotto de la Troisieme Dive Info

Terrain & Features

Cave, Inland

Entry Type

Shore

Max Depth

Visibility Range

25m – 75m

Experience Level

Advanced

Best Gas Mix

21%

O₂

CNS Load (45 min)

5% at 5m / 36%

O₂

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Marine Life

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Location

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Dive Site Hazards

Remote Silt Disturbance — Silt can be disturbed metres away from the source.
Rapid Stress Escalation — Stress can increase sharply when visibility or navigation degrades.
High Cognitive Load Navigation — Complex passages increase mental workload even on a line.

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.

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