Doug Perrine / Shimmering heat waves distort the image of diver as he samples erupting pillow lava at ocean entry of Kilauea Volcano, Hawaii Island.

Doug Perrine / Videographer filming pillow lava erupting underwater at Kilauea Volcano, Hawaii.

Doug Perrine / Diver shaping erupting pillow lava by hand to form underwater lava sculptures at ocean entry from Kilauea Volcano, Hawaii.

Doug Perrine / Diver sampling red hot pillow lava at underwater eruption of Kilauea Volcano, Hawaii.

Franco Banfi / Scuba diver coming up after a dive inside the volcanic crack Nesgja, in the Asbyrgi National Park, northern Iceland

Bryan and Cherry Alexander / Dive boat by Pinnacle Rock, the eroded remains of a tuff cone, by the the volcano on Isla Bartolome. Galapagos, January 2005.

Fred Bavendam / Nusantara Dive Center boat anchored at Bunaken Island dive site with Manado Tua Volcano in the distance, Manado, North Sulawesi, Indonesia