Guernsey's Sea Donkey's challenge for La Vallette pool has already raised £64,000.
Adrain Sarchet is in training for his 24 hour non-stop swim in August.
He is raising money for step-free access to the La Vallette bathing pool, which is undergoing a complete modernisation.
Already £64,000 of the £150,000 target has been reached.
The most recent donation is a generous sum of £31,000 from the Friends of La Vallette LBG - representing some 200 regular swimmers - which adds to earlier donations from The Guernsey Community Foundation and The John Ramplin Trust.
The £31,000 includes money from keyholders to the changing rooms and the sale of shower-tokens.
Brian Chapman from he Friends of the Vallette LBG says putting the cash towards the access ramp will be 'a fitting legacy that recognises the many hours that our volunteers have given'.
Left to right: Maarten Angenent, Contracts Manager for Geomarine, Brian Chapman, on behalf of the Friends of the Vallette LBG, Helen Bonner-Morgan, Community Lead for Vive La Vallette LBG and Adrian Sarchet (a.k.a the Sea Donkey).
Adrian is delighted with the public response so far.
"I am profoundly grateful to all the brave people who have agreed to swim by my side and/or to contribute to the fundraising effort. I am humbled by the Friends of La Vallette LBG's donation, which represents the combined goodwill of hundreds of local swimmers over decades.
I have entered "the hard yards" period of my training progression, and still have a "training mountain" to climb, but this groundswell of public support has energised me to train harder than ever. I am hopeful that Guernsey's corporate sector will recognise this momentum and support this community mission by entering corporate teams."
The cash will pay for a ramp into the Ladies Pool and better access to the changing rooms and cafe, as well as a lift to the upper floor of the building.
Vive La Vallette LBG is encouraging corporate and social teams to get involved by fundraising and by entering a team of up to six to swim alongside Adrian in hourly slots.
The Sea Donkey 24 Hour Swim Challenge starts at 3pm on Saturday 20 August 2022 at the Ladies Pool.
Registration to join Adrian is open on the charity's website.