In Iceland we have about 700 lava tubes. Raufarholshellir is one of the longest and the biggest.

5200 years ago, during the eruption of Leiti (in Blafjall), flowing lava has built up this tunnel.

The sound was collected during the winter, when the floor is covered with “ice stalagmites” that are singing in the raindrops. 

See also:  Þverbrekkuvatn

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