Royal Navy bomb disposal experts destroyed a 1,500lb (680kg) mine on November 27.
The German mine was discovered on the seabed in The Solent, the strait separating the Isle of Wight from mainland England.
The World War Two GD ground mine was found by a crane barge 1.5km off Southsea on Thursday while removing debris from a site being dredged next month in preparation for the arrival of the Navy’s new aircraft carriers.
The bomb disposal team – also fully-qualified clearance divers – towed the air-dropped device overnight to open waters about 1.5km off Bembridge, Isle of Wight, where they carried out a controlled explosion.
The explosion created a plume about 300 metres high.
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Image, video: Royal Navy