National Geographic : 2012 Jul
Explore the crystal interior of Hut Cave in the iPad edition. Inside the ice caves the volcano s warm, wet air freezes into frost crystals that grow into di erent shapes, depending on how the air currents ow. Here, a team member investi- gates the passages of Hut Cave. At le , light lters greenly through a vent encrusted with frost crystals in Warren Cave.