
Volcanos, earthquakes, hurricanes and the ozone.

George Kourounis visits Tornado Alley, descends into the Erta Ale volcano and witnesses the force of Hurricane Katrina.

Diving with great white sharks; exploring a flooded cave; jet-boating.

George Kourounis is joined by Mark Robinson, climbing to the top of New Hampshire's Mount Washington in a mid-January summit blizzard.

Traversing, by rope, Boiling Lake on the Caribbean island of Dominica, a waterfall-fed lake of boiling water.