Air force personnel will scale three mountains while strapped into 35kg bomb suits in aid of a colleague who is being treated for cancer.
Members of 5131 Bomb Disposal Squadron, based at RAF Wittering, will climb Snowden, Scafell Pike and Ben Nevis in aid of Macmillan Cancer Support later this month.
The challenge is daunting enough on its own. But to make things even harder for themselves, the group will wear the Explosive Ordnance Disposal suits used during operations for the entire walk.
And just to round things off, they will also cycle between the three peaks.
The group took on the challenge in honour of Flt Sgt Tommy Tomiczek, who is undergoing treatment for cancer.
Sgt Mark Williams will be among the climbers. He said: “We wanted to do something above and beyond what is normally done. Something harder and more eye-catching. The Three Peaks have never been done in a bomb suit.”
The group are fully aware of how difficult the challenge will be. Sgt Williams added: “Movement is very restricted. It’s very hot and very cumbersome.
“We usually only go about 200m, although we have all spent up to eight hours in the suit.
“It will just be a case of digging in and going for it. But it’s not as hard as what people with cancer have to face.”
The group set off on June 12 and hope to raise £5,000. You can sponsor them at www.justgiving.com/RAFbombdisposal