East Sussex Fire & Rescue Service recovered a body from a pond within the grounds of Hastings Conquest Hospital last night (30th April).
Two crews from Battle were called to the incident at 7.15pm and a water rescue path used to assist with the recovery.
The protracted rescue came to an end at 11.17pm and both Scenes of Crime Officer (SOCO) and a coroner were called to the scene.
Initially, 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 who attended the scene at 7pm discovered that the area around the pond was extremely boggy and hazardous and as a result they called upon colleagues from East Sussex Fire and Rescue Service to assist with the recovery of the body.
Detective Inspector Hannah Willard said: "Sadly, we believe that the man is 47-year-old Gary Baker who was reported missing after leaving the hospital on Friday (April 25). A post mortem will take place to establish the cause of his death, but until that time, we are treating it as unexplained."