Grjótagjá, a cave near Lake Mývatn in Iceland

Grjótagjá, a cave near Lake Mývatn in Iceland

© Joerg Abendroth/Tandem Stills + Motion

Grjótagjá, a cave near Lake Mývatn in Iceland

Grjótagjá, a cave near Lake Mývatn in Iceland

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