Black Rock / Ulua Cave

Hawaii, United States

Depth

27m

Visibility

8m - 23m

Entry

Boat

Experience Level

Experienced

Black Rock / Ulua Cave

Hawaii, United States

Depth

27m

Visibility

8m - 23m

Entry

Boat

Experience Level

Experienced

About Black Rock / Ulua Cave

Black Rock is mainly a wall dive with depths of between 40 to 90 feet and a huge cavernous chamber roughly 100 feet long and 50 feet wide. The mooring buoy will allow you to go to 55 feet, which is also the top of the rock outcropping. The room has various entry and exit points due to erosion. A drop of 90 feet over a near wall takes one to a massive underwater chamber where one can view white-tip reef sharks and turtles. Amazing hard coral polyps can be viewed living on the ceiling as well as the sporadic Kona crab or spiny lobster. Visibility is good as long one takes care not to kick up sand.

Black Rock / Ulua Cave Dive Info

Terrain & Features

Rock, Other, Cave

Entry Type

Boat

Max Depth

27m

Visibility Range

8m – 23m

Experience Level

Experienced

Best Gas Mix

21% – 38%

O₂

CNS Load (25 min)

13% at 25m / 36%

O₂

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Marine Life

Corals
Eels
Octopus
Snapper
Squirrel Fish

Weather Conditions

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Dive Operators near Black Rock / Ulua Cave

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Location

Location details missing.

Dive Site Hazards

Bubble Trapping Under Overhangs — Rock overhangs can trap exhaled bubbles, reducing visibility and causing disorientation.
Reflected Surge Patterns — Surge reflecting off rock faces can create irregular and unpredictable water movement.
Current Funnel Effect — Narrow gaps between rocks can accelerate water flow unexpectedly.

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.

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