Paul said the most frightening moment came when he nearly got lost.
"The markers were not very clear and I wasn't sure what path to take.
"I lay down on the ice in my sleeping bag to wait for someone to come. The ice started to crack and I got a bit frightened.
"In the end, I saw the torchlight of a fellow competitor and shouted out for help."
The group all passed the finishing line in under eight days, with Mark rewarded for completing the fastest final leg.
Paul, whose feet, normally size eight, were so swollen he had to borrow a pair of size 13 trainers to travel home, said: "We are all pleased we did it. The purpose of any challenge is to finish it and push yourself to see what you can do.
* So far, the group have raised around £10,000 for Debra but you can still donate - go to www.justgiving.com/tent67, email tony.eckersall@debra.org.uk, ring Tony on 07786 575512 or send donations to 10 Hambleton Road, Stockport SK8 3DW.
* The genetic condition epidermolysis bullosa is caused by one defective gene. It means skin blisters and falls off, leaving open wounds.
* Advances in EB are being made by researchers all over the world. They are collaborating to work towards clinical trials, which they are looking forward to in the next few years.
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