The second video of our 'Journey to the Antarctic' series covers the journey to Antarctica across the notoriously dangerous Southern Ocean. The SA Agulhas II is battered by powerful waves despite the expedition's attempts to avoid large storms. Dan Snow reflects on how several members of the crew of Endurance would later be forced to cross the ocean in the James Caird - a small wooden lifeboat - to reach the safety of South Georgia.

Crushed by the polar ice of the Weddell Sea in 1915, no previous attempt to locate the wreckage of Endurance has been successful.