Documentary charting the extraordinary attempt by four severely-injured Afghan veterans to complete the first unsupported trek by wounded soldiers to the North Pole.
2/2 160 miles from the geographic North Pole, the soldiers are tested to the limit.
Find out how Captain Martin Hewitt used the Arctic trek as a motivator to recovery from losing the use of his arm: "Should I make it to the Pole it would not only be an achievement, but to me it would signify overcoming the injuries I'd sustained in battle."
Read and comment on Martin's post on the BBC TV blog
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