On 1 February 2014, 100 of Britain’s top swimmers came together to smash a world record and raise money for blood cancer charity Leukaemia & Lymphoma Research. The event was organised by Team GB swimmer Lewis Coleman, after his mum was diagnosed with leukaemia in 2012.
We were poolside, speaking to the swimmers as they came out of the water to find out what the day meant to them. See what they had to say by watching the video on the left.
The swimmers featured in the video are:
There's still time to support the unstoppable Swim4Leukaemia relay team. To make a donation online, please visit Lewis' JustGiving page.
You can find out more about Lewis' family by reading his mum's story on his blog.