A 12-inch ordnance shell was detonated along the Warsash seafront this afternoon.
The detonation is believed to have happened at around 2.30pm after it was discovered by a dog walker this morning.
Hillhead Coastguard were sent to the scene and established a safety cordon before Royal Navy bomb disposal experts detonated the rusty shell.
A spokeswoman for HM Coastguard said: 'We were tasked to Warsash seafront this morning after a member of the public walking their dog discovered an unexploded ordnance shell.
'Hillhead Coastguard established a safety cordon before the explosive ordnance disposal unit then detonated the shell.'