Twin Tunnels Reef

Type:

Scuba DivingFreediving

Entry:⚓Boat Entry

Difficulty:Advanced

Tags:

CaveDeepReef

About This Dive Spot

A pinnacle reef that rises from deeper water to around 15 m below the surface. Two vertical shafts drop from the reef top to a chamber, with a cave exit around 36 m. Currents attract both predator and prey, and the site is described as healthy, colorful, and vibrant, with enough to warrant multiple dives.

Planning details

Reported depth and seasonality.

Reported depth

15m - 70m

Depth note

Reef pinnacle comes to within ~15 m of the surface and rises from 70+ m; vertical shafts lead to a chamber with a cave exit at ~36 m.

Typical conditions

Current can be present around the shafts and cave exit where marine life congregates.

Safety & access

Hazards, restrictions, and required precautions.

Hazards

Strong currentOverhead environment

Safety notes

Includes an overhead environment (shafts/chamber/cave exit) and can have strong current; plan for deep profiles and appropriate training and gas management.

Local intel

Community notes to help plan your visit.

Tailored notes for different activities.

Scuba

Best suited to advanced divers due to depth and the overhead chamber/exit around 36 m.

Dive Spot Log Averages

Average conditions based on logged dives & visits

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Dive Conditions Planner

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Spots Near Twin Tunnels Reef

📍 1.7 km

Balydon Shoals

Not Set

Balydon Shoals is a long, shallow reef about 400 m in length with a top around 18 m. The reef top is described as fairly flat and relatively barren, influenced by strong currents running across it. On the southwest side, a striking wall drops off and serves as a focal point where fish gather in the water column, making the site well-suited to drifting dives.

📍 2.3 km

USS Kanawa (Wreck)

Not Set

A 476-foot fleet oiler and freighter that sank on 7 April 1943 after an attack by Japanese aircraft. The wreck lies upright on a sandy seabed, with the bow around 40 m and the stern descending to about 55 m. It attracts large schools of fish around the structure.

📍 3.2 km

PBY Catalina Seaplane (Wreck)

Not Set

An upright PBY Catalina seaplane wreck rests on the side of a reef, with the cockpit around 26 m and the tail around 33 m. The airframe is largely intact, though the engines have detached and sit on the seafloor beside the wreck; munitions and machine guns are still present. The wreck is covered in soft corals with some hard coral growth, and attracts schooling reef fish and smaller critters around the structure.

📍 3.9 km

Raiders / F4F Wildcat (Wreck)

Not Set

This site features a US F4F Wildcat aircraft wreck resting at 42 m. Discovered in 2015, the plane is largely intact aside from a missing propeller, with the cockpit area, instruments, and gun sights still in place. Conditions can be silty, and timing the dive for slack or an incoming tide is preferred. Fish life commonly seen around the wreck includes snapper, trevally, and sweetlips.

📍 4.6 km

Base 1 Muck Site

Not Set

This muck dive sits at the northern end of a harbour bay that served as a World War II repair area for US combat engineers. The bottom is scattered with wartime debris, including landing craft, munitions, small cargo ships, fishing boats, and aircraft parts. It’s a critter-rich environment with patches of large plate corals, and juvenile sweetlips are commonly seen.

📍 4.8 km

Gavutu F4F Wildcat (Wreck)

Not Set

A WWII-era F4F Wildcat aircraft wreck lies on a sandy bottom at about 42 m. The propeller is missing and the engine cowling has fallen off, leaving recognizable structure to explore. The site is very silty, with trevally and snapper commonly seen around the wreck, and a resident painted crayfish near the starboard undercarriage. It’s described as best dived at slack tide.

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Frequently Asked Questions

What's the best entry point at Twin Tunnels Reef?

Entry at Twin Tunnels Reef is detailed in the spot description above. Look for specific landmarks, access paths, and any tide or condition requirements. Local divers often share updated entry tips in their dive logs.

What conditions are best for diving Twin Tunnels Reef?

Optimal conditions at Twin Tunnels Reef depend on several factors including tide, wind, and season. Check recent dive logs for current condition reports and patterns. Generally, calmer seas and high tide provide better visibility and easier entry.

What is the maximum depth and typical visibility at Twin Tunnels Reef?

Depth and visibility information for Twin Tunnels Reef can be found in the spot details and recent dive logs. Conditions can vary significantly based on weather, tide, and season. Always plan your dive according to current conditions and your certification level.

Are there any safety considerations or local etiquette at Twin Tunnels Reef?

When diving Twin Tunnels Reef, respect local regulations, marine life, and other water users. Be aware of any specific hazards like currents or boat traffic mentioned in the spot description. Follow Leave No Trace principles and local diving etiquette.