Into Iceland's volcano

Freysteinn Sigmundsson, May 3, 2011

Recent National Geographic Channel documentary describes research on interior of Icelandic volcanoes, including an expedition into the crater cave of Thrihnukagigur, a 200 m deep cave right into the topmost part of an active volcano plumbing system. Me and Haraldur Sigurðsson joined to explore the geology. See photos and videos here.  May 3 coverage and more photos in Daily Mail:  Here