An underwater search unit was called to a Lincolnshire drainage dyke on the morning of Monday, February 8 after a body was discovered by a member of the public.
The body of a male was found in the dyke off Sutton Road, Trusthorpe.
A member of the public alerted police at 8.30am and an underwater search unit is on scene to assist with recovering the body on behalf of the coroner.
The body is believed to be that of a man but he has not yet been identified.
Lincolnshire Police say his death will be treated as unexplained until the results of a post-mortem are known.