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The strange sound of Wormit water reservoir

19 December 2012 Last updated at 17:41 GMT

Trevor Cox, a professor of acoustic engineering at the University of Salford, has identified Wormit water reservoir as one of the strangest sounding places in the UK.

Like a cathedral, the sound takes a long time to die away in the decommissioned reservoir near Dundee.

The clip is of a balloon being burst in the reservoir.