
These formations provide the setting for ice climbing, one of the most technically demanding disciplines in mountaineering, in which climbers ascend using specialised ice axes, crampons, ropes and protection placed directly into the ice.

Most extreme sports leave some margin for error. A climber can turn back a hundred metres from the summit. A big-wave surfer who wipes out can be pulled from the water by a jet-ski waiting nearby. Cave diving offers no such second chances. Go deep enough into the wrong passage, and the only thing standing between a diver and never being found again is a single thin line he laid down himself, and his own discipline in following it back.

There's a moment, just before a surfer drops into a wave as tall as a five-storey building, when the jet ski lets go of the rope and leaves him alone on a mass of water moving at highway speed.

Paragliding is one of the rare sports that offers a true sense of freedom. No engines, no noise—just the wind, the wing, and views that stay with you for a lifetime. That same feeling often draws people in quickly. But rushing into the sport is also the source of its most common beginner mistakes.