The explosive was found by a member of the public, and detonated by the bomb disposal team.
An islander who lives nearby commented on Facebook saying: “We felt and heard it! It reverberated throughout the house!”
The Coastguard reminded islanders that if they find anything that looks like unexploded ordnance, they should stay clear of it, not touch it, and report it on 447705 straight away.
The what3words app or the compass app can be used to provide an accurate location.