Police believe that the body found in a pond on the grounds of Hastings' Conquest Hospital is that of missing patient Gary Baker.
Police were called to the grounds of the hospital on Tuesday evening where the body of a man had been spotted in a pond by a local man walking his dog.
Officers had to call in the fire service to recover the body after discovering the area around the pond was extremely boggy and hazardous.
A body found in a pond inside a hospital's grounds is believed to be of a man reported missing after discharging himself following an operation.
A dog walker called emergency services after spotting the corpse in the groundsof the Conquest Hospital in St Leonards-on-Sea, East Sussex, yesterday evening.
Sussex Police, who are treating the death as unexplained, believe the body is of 47-year-old Gary Baker who left the hospital following an operation on April 25.