Photo by @shonephoto (Robbie Shone) - Deep beneath the fiery red summit of Mount Etna in Sicily, Europe's highest active volcano, more than 250 lava tubes have been explored in a cold, pitch black subterranean world. Grotta dei Tre Livelli (Cave of the Three Levels) is a 1150m (3772ft) lava tube located on Etna's southern flank. Here a cave explorer can be seen climbing up a ladder from the middle passage to the highest level passage. Happy Earth Day everyone!
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