Officers are continuing with their enquiries tonight following the discovery of a body near to the Hot Walls in Old Portsmouth this morning (Friday, February 5).
The man, aged in his early 20s, was discovered by a member of the public at around 8am.
A post mortem examination has taken place, and established that the man died as a result of drowning.
The man has not yet been formally identified.
Officers investigating the incident are currently treating the death as suspicious.
Can you help?
Anyone with information is asked to contact police in Portsmouth quoting Operation Corvid on 101 or call the Crimestoppers charity anonymously on 0800 555 111. Mini-Com users can call 01962 875000. From outside Hampshire and the Isle of Wight, please call 0845 045 45 45.