Graeme Kelly, 46, and Tony Saunders, 52, undertook the challenge to swim the equivalent of the English Channel at its narrowest point, 22 miles.
They raised £640 for Aspire, a national charity that provides practical help to people who have been paralysed by spinal cord injury.
The distance can be covered over a 12-week period, but the pair decided to try to complete it in one day.
Both are experienced athletes, though Graeme said: “When I told my family I wanted to do the swim in one day, they thought I was mad!”
Between them they swam 84 miles in training. On the day itself Graeme had to bow out at the 12-hour mark due to a shoulder injury, having completed 18½ miles, but Tony completed the marathon effort.
Graeme is determined to complete the challenge next year and is contemplating an open-water version in one of the local lakes.
He said: “All the staff were really helpful on the day, it was great. I wore waterproof headphones and listened to music for most of the swim.
“The fundraising went really well, but we also wanted to raise a bit of awareness.”
For more information about the Aspire Channel Swim, visit aspire.org.uk/swimming
