A Royal Marine climbed more than 3,000ft in nine hours to help raise money for the Children's Happy Hospital Fund.
Sergeant Rob Garthland, a physical training instructor at HMS Raleigh, the Royal Navy's training base at Torpoint in south east Cornwall, completed 110 climbs of a 30ft rope during the challenge.
Starting at 7am, 32-year-old Sgt Garthland climbed throughout the day and finished just before 4pm. He is hoping to raise at least £1,000 for the hospital fund.
He said: "It was the first time I'd attempted anything like this and I must admit it felt pretty good to get to the end.
"I paced myself throughout the day and for most of it I had other people with me, taking part in the departmental competition, which was great.
"There is a technique to the climb and I was teaching some of the others as we were going.
"It is tough and I can certainly feel it in my legs and arms, but overall I'm glad I've done it and I hope people will continue to show their support so we can raise a lot of money to help the children in hospital."
Rope climbing is one of the toughest parts of the physical training programme for Royal Navy recruits as they undergo their 10-week course.
Personnel from departments within HMS Raleigh also climbed alongside Sgt Garthland. Sailors and Royal Marines from the establishment's Military Training Unit took the first prize, completing 86 climbs between them.
