Two thousand people squeezed into wetsuits, donned goggles and took the plunge at the Great East Swim in Alton Water, near Ipswich, today. Including a team from ITV Anglia who challenged a team from BBC Look East to a race.
See Kate Prout's report here
Swimmers, young and old, chose to swim either half a mile, a mile, two miles or 10 kilometres. And there was a special race for children too.
Most people were raising money for well known charities. And as for the ITV and BBC race - we'll have to wait to confirm our times to know who won!