Basically the map could look like this --> expanded -->
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His story is here
http://en.wikipedia.org/wiki/Ernest_Shackleton
There are books and an Imax film about his adventure.
Here is a link to the film... http://topdocumentaryfilms.com/the-endu ... expedition -- not sure if this link works yet,m have not checked.
If I remember from the book, they have to leave most of their mates in a cave island, search by stars for a remote whaling port, are starving, climb an ice mountain then have no way down the other side because its almost a straight fall, they then make a human train and slide on their asses down the ice mountain to the whaling station... Its actually an incredible story.
Anyway, this could be a pretty fun epic map.