A body has been found in Lake Wānaka on Friday afternoon by the Police national dive squad.
The squad was searching for a swimmer who went missing on Thursday night.
"While formal identification is yet to be completed, police believe it is the body of the swimmer who was reported missing at around 6:30pm on Thursday, after failing to resurface," Senior Sergeant Chris Brooks said in a statement.
Snr Sgt Brooks added police extend their condolences to the deceased's family and friends.
Police will be making enquiries into the person's death on behalf of the Coroner.
