It took an Olympian effort - but a new world swimming record was set in Sheffield to help victims of leukaemia.
Some 100 swimmers responded to the Ponds Forge challenge of Lewis Coleman whose mum, Maggie, was diagnosed with the condition in June 2012.
They smashed the 100mx100m swimming relay record by eight minutes, clocking up one hour 29 minutes and three seconds.
Double Olympic gold medallist Rebecca Adlington and silver medallist Michael Jamieson were among the top swimmers joining Lewis, aged 22, his brother, Oliver, ten, members of City of Sheffield Swimming Club and others.
Lewis, who lives in Hillsborough, swims for four hours every day and is training for the Commonwealth Games in Glasgow ahead of the Rio Olympics in 2016. He raised £20,000 for the charity, Leukaemia and Lymphoma Research.
“It’s been an absolutely fantastic day,” he said. “I’d like to thank everyone for coming down, everyone’s support has been overwhelming.
“My world was rocked when mum was diagnosed with leukaemia and I decided I wanted to raise money to help beat blood cancer.
“I wanted to do my bit so that more people can have access to new drugs or clinical trials to help them beat this disease. Swimming has always been a massive part of my family’s life so I thought it would be fitting for the fundraising event to be swimming related.”