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12 May 2012, 12:27
A noise as loud as a jet taking off is going to be on hand for the MOD to use during the London Olympics.
We're told it'll mostly be used as a loud-hailer to get messages to any boats on the River Thames that are causing concern.
The Ministry of Defence confirmed that it was among a "broad range of assets" being used by the armed forces to provide security during the Games.
The device is used by the US Army as a "sonic weapon".