The object, which is thought to be a WWII shell, was found at Birling Gap beach on Monday (March 21) by a member of the public, who alerted the Coastguard.
The coastguard photographed the shell, which was badly corroded and therefore had no identification marks, and sent the images to Explosive Ordnance Disposal (EOD) for clarification.
Due to high tide, EOD experts said they would attend the beach the following day.
On Tuesday, Birling Gap Coastguard cleared the beach area and members of the Royal Navy Bomb Disposal team took the shell into the water for detonation.
The controlled explosion took place around 4.30pm and the beach was reopened shortly after 5pm.
Photographs taken by Alan Fraser.
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