Volcanoes fume beneath Icelands Vatnajökull glacier, a sprawling ice field about the size of Rhode Island and Delaware combined.
In October 1996 a new fissureGjalperupted, burned through the glacier, spewed ash high into the sky, and unleashed a catastrophic meltwater flood.
Rope up with online correspondent Ford Cochran and follow world-renowned volcanologist Haraldur Sigurdsson as he climbs, crawls, and paddles his way deep into the belly of this smoldering beast.
© 1998 National Geographic Society. All rights reserved.