forward. an expedition is setting off this weekend to try to find the shipwreck of the antartic explorer sir ernest shackleton. his vessel the endurance sank more than 100 years ago and is believed to be nearly two miles below sea level. 0ur science editor rebecca morelle has been to meet the team hoping to find the wreck. caught on camera more than 100 years ago. the final moments of the endurance. this footage restored and released by the bfi, shows sir ernest shackleton's famous ship as it was lost to the antarctic ice. there's the endurance. now a new expedition is attempting to locate the ship, but like shackleton, they'll face grueling conditions. the endurance is the... the most unreachable wreck in the world, and the big challenge is the ice. it's opening its clenching, its unclenching.