The mine, described as a World War Two air-dropped device, was located by Royal Navy divers in Weymouth Bay.
They called in Royal Navy diving colleagues from Portsmouth’s Explosive Ordnance Disposal team.
At the weekend a cordon was set up around the site, which lay near a designated safe-anchoring area for shipping, after which the ordnance divers carried a controlled explosion.
The find follows the discovery last March of a large mine in nearby Portland Harbour. The large air-dropped mine had escaped notice in the busy harbour for 65 years, despite sitting well proud of the seabed.
The latest find off Weymouth brings to six the number of wartime mines and bombs located and destroyed off British shores in the past 16 months.
Related links
Mine find, Plymouth (September 2010)
Bomb find, Portsmouth (April 2010)
Mine find, Portland (March 2010)
Mine find, Firth of Forth (October 2009)
Bomb find, Swanage (October 2009)
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