The Great East Swim was officially launched this morning in Suffolk.
The event in June will see thousands of swimmers take the plunge at Alton Water Reservoir near Ipswich.
Swimmers can chose from a half mile, to 5km swim, with thousands of pounds raised for charity at the same time.
Nearly two thousand people took part in the Great East swim - among them two Olympic swimmers who are hoping to go for gold in the open water events at London 2012.
Russell Hookey spent the day at Alton Water near Ipswich and saw the action: