Trevor Cox, an acoustics expert from England, has smashed the world record for the longest echo.
The teacher of acoustic engineering at the University of Salford in Manchester recorded the sound of a gunshot echo that lasts a full 75 seconds.
The echo was recorded in an oil tank in the Scottish Highlands. It shattered the previous record, set in 1970, by 15 seconds.
Click on the audio clips above to hear the echo and an interview with Cox on CBC Radio's As It Happens.
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