Published Sunday, 15 July 2012
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Keith Clarke from Dungannon, his cousin Bob Davidson from Cookstown, and Andrew Hassard from Ballyclare have been undertaking their challenge at Eskragh Lough in Dungannon in aid of Cancer Focus Northern Ireland.
Each day they will complete a 2.4 mile swim, 112m bike ride and then a 26.2m marathon, and they are set to join only 60 other people in the whole world who have completed the challenge.
UTV caught up with the athletes, and Keith said he is starting to feel the pain.
"So far the swims have been pretty good, take it steady on the bike, I suffered a bit yesterday when my foot and ankle started to get a bit sore.
"The first couple of swims take a while to get going but once you get going it's not too bad."
The trio have all previously completed triathlon and ironman competitions, and they embarked on the Decaman triathlon as their latest challenge.
Bob said he was trying "not get too carried away with speed and try to make sure that I'm ticking the miles off".
"Each day is one closer to the end," he added.
Family and friends have lined the route over the days to support the men, providing food and washing and drying clothes.
Keith's dad Dennis said the Decaman is not easy to watch.
"It's hard on all of us because we are standing about watching but it's ten times worse on them.
"But at the end they will be a group of elite athletes," he said.
And for Keith, although the end is in sight, he is ready for the next test of strength.
"It will make me very proud," he said, "and we will start again for next year and think of something else stupid to do."