A team of Canadian scientists and filmmakers sails to Antarctica aboard the 54-metre ship Sedna IV on a mission to document the most important environmental challenge facing our planet: climate change.

A team of Canadian scientists and filmmakers sails to Antarctica aboard the 54-metre ship Sedna IV on a mission to document the most important environmental challenge facing our planet: climate change.

Second Platoon first struggles to recover from an IED blast sustained on the last mission, while Third Platoon clears a landing zone where two British helicopters need to unload a 60-man assault force under the cover of darkness.

RATED 14+. Bear Grylls flings himself out of a plane and parachutes to safety to reach this remote area, where he crosses the country's highest mountain range and starts a fire in a waterlogged forest.

RATED PG. Supplies are low, fish few and luck bad; Bjorn 2 must fish short-handed when Deckhand Dave goes overboard and Captain Linda is forced from the deck when her hand accidentally gets caught in the hauling block.