Antarctic team 'upbeat' about hope of finding Shackleton's ship

The Endurance sank in the Weddell Sea in 1915, after 10 months trapped by ice

Antarctic explorers are to break their way through 75 miles of sea ice in an effort to reach the final resting place of Sir Ernest Shackleton's ship, the Endurance, which sank to the bottom of the Weddell Sea in November 1915.

Expedition leaders believe they have the best chance yet to find the wreckage of the lost vessel, which became trapped in sea ice for 10 months and eventually went down in two miles of water after the crushing forces of the surrounding ice breached its hull.