Tunnels Reef and Beach

Hawaii, United States

Depth

20m

Visibility

10m - 30m

Entry

Shore

Experience Level

Beginner

Tunnels Reef and Beach

Hawaii, United States

Depth

20m

Visibility

10m - 30m

Entry

Shore

Experience Level

Beginner

About Tunnels Reef and Beach

A horseshoe reef with many tunnels, hence the name. There is also many caverns and lava formations to explore. The inner reef is calm and has gentle currents for the beginner divers, while the outer reef is for the more advance divers due to drop offs.

Tunnels Reef and Beach Dive Info

Terrain & Features

Reef, Drop Off, Drift

Entry Type

Shore

Max Depth

20m

Visibility Range

10m – 30m

Experience Level

Beginner

Best Gas Mix

21% – 47%

O₂

CNS Load (35 min)

12% at 18m / 36%

O₂

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Marine Life

Moray Eels
Rabbit Fish
Sea Turtles
Tangs
Trigger Fish
Trumpet Fish
Wrasse

Weather Conditions

Water Temperature ℃

Dive Operators near Tunnels Reef and Beach

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Location

Dive Site Hazards

Hidden Depth Variations — Complex reef topography can conceal depth changes, leading to unintended profile variations.
Distraction from Marine Activity — High fish activity can distract divers and delay depth or gas awareness.
Rapid Surge Direction Changes — Surge near reef structures can reverse direction quickly, pushing divers sideways into unexpected areas.

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.

Eddy Pull-Off Zones — Eddies behind structures can pull divers away from the main drift line.

Delayed Surface Pickup — Strong current can exceed surface tracking assumptions, delaying boat pickup.

Vertical Current Shear — Currents may vary by depth, causing vertical separation even when divers stay together.

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