The PSNI is trying to identify a man whose body was discovered on Saturday in the sea close to Ardglass Harbour, Co Down.
A post mortem examination is being carried out to determine the cause of death.
He is described as 30-40 years old, of medium build, 5'8'' (1.73m) tall, with light facial stubble and a round face.
He had dark or black receding hair that was combed back.
The man was wearing a navy blue woollen jumper over a horizontal light and dark blue striped long sleeved top, blue denim jeans and brown casual trainers.
Police are also investigating a line of inquiry that the man may have recently been in the Republic, as he was carrying Republic of Ireland issue euros.
Anyone who recognises the description, or thinks they know who the man may be, is asked to contact police in Downpatrick on 0845-600-8000.
