Explorers: Adventures of the Century

Will Gadd, pushes the boundaries of ice climbing by scaling the frozen 140m high cave behind Canada's Helmcken Falls.

Steve Fisher and his team set out to conquer The Inga Rapids of the Congo River the holy grail of kayaking, featuring bigger and more dangerous waters than anywhere else on earth.

Attempting the first ascent on the face of Mount Roraima, in Guyana, is a big draw for climbing legend Stefan Glowacz and his team. But a tragic accident changes everything.

Majlis al Jinn, a huge subterranean chamber in Oman, is big enough to house the Great Pyramid of Giza. Climbers Chris Sharma and Stefan Glowacz attempt an ascent from the bottom of the cave.

Rafa Ortiz and a group of kayakers who specialise in big waterfall drops attempt to run a section of the Mexican Rio Santo Domingo that's the steepest navigable whitewater on Earth.

Zeb Walsh has dreamed of paddleboarding the channel between Australia and Tasmania since he was 15 years old. In his death defying attempt, he enlists two friends to brave the shark infested waters.

Combining skiing and paragliding, Jon Devore and some of the most accomplished athletes in the sport of speed riding want to tackle the 'unrideable' giants of Alaska.

Diving legend Brian Kakuk believes that two of the biggest cave systems in the Bahamas are actually one massive one and he's determined to prove it.

Will Gadd and Gavin McClurg attempt to complete the first paragliding traverse of the USA's Rocky Mountains. The 1200km trek will be a world record flight if they make it.

Antarctica's Mount Erebus has one of only five permanent lava lakes in the world. British geologist Clive Oppenheimer sets out to measure the temperature of the volcano’s lava.