
Adventurers seek new and extreme challenges.

Jon Durand has dared loop-the-loop aerobatics on the leading edge of the Morning Glory, a rarely spotted, two kilometer-high tube cloud phenomenon.

If Troy Watson and Kieran McKay can connect New Zealand's Nettlebed and Stormy Pot systems, the find will be the biggest cave in the Southern Hemisphere.

Stefan Glowacz and Chris Sharma descend into Majlis al Jinn in Oman, the second largest known cave chamber on the planet, located about 1500 metres above sea level.

Professional whitewater kayakers attempt to set a new world record by kayaking the steep Angels Wings Falls, of the Rio Santo Domingo Canyon, in just one day.