Tanna & Lenakel · Vanuatu · Cave & cavern · Reef
Blue Hole One
Four linked sinkholes with tunnels out to the reef
Area photo: Dominik Maximilián Ramík · CC BY 4.0
Blue Hole One is a cluster of four sinkholes in Tanna’s fringing reef, joined to each other by swim-throughs and tunnels. Caves worn through the volcanic rock lead out of the holes to the outer reef, which makes it one of the island’s two showpiece shore dives.
Also known as Blue Hole 1.
Where it is and how deep
No published position for this site — the map shows Tanna & Lenakel and its other sites; operators know the mooring.
The dive
The holes lie about 50 m off the beach, so the dive starts with a short swim out from shore. Inside, the four sinkholes connect through swim-throughs and tunnels, and the floor of the holes sits at about 9 m. From the holes, several caves and swim-throughs eroded through the volcanic rock open onto the outer reef, which reaches 15 m.
Marine life and season
The sources we used don't single out particular species here.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fair | Fair | Fair | Good | Good | Good | Good | Good | Good | Good | Good | Fair |
Season follows Tanna & Lenakel: Diving runs all year; December to March is the peak of the rainy season, when bigger storms can make diving unsafe.
Dive videos
Chucky's cave and Blue Hole One, Tanna, Vanuatu · Volcano Island Divers on YouTube
Sources
- Tanna Island Dive Guide — Dive Adventures
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