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Swim in the Blue Cave, Tanna Island, Vanuatu

The Blue Cave is a hidden sea cave accessed by a swim-through passageway. A huge cavern with a partially collapsed roof that allows a dazzling beam of sunlight to stream in and illuminate the turquoise lagoon. It's located on the island of Tanna in Vanuatu. You have to snorkel out at low tide to the entrance and dive down through the opening to get inside.
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