After resting halfway, the team races in -40 deg C temperatures to reach the finish line.
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The team begin the second half on good form, but perilous conditions take a dangerous toll
The team get off to a flying start in the race, and quickly take the lead.
Ben Fogle undergoes an intensive course of treatment for a lethal tropical illness.
Jonny pulls out due to work commitments, leaving Ben and James in need of a new team mate.
James Cracknell and Ben Fogle start their training and find a third team member.