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Hear The World’s Longest Echo…

canmore_image_dp_06_DP069141interior of Inchindown oil tank

In 1970, the Guinness Book of World Records listed the world’s longest echo at 15 seconds long.  That’s pretty embarrassing compared to the new record of one minute and 12 seconds.

Trevor Cox, Professor of Acoustic Engineering at the University of Salford, discovered the echo while researching for his book, Sonic Wonderland: A Scientific Odyssey of Sound.


The record was broken in the oil storage complex at the Inchindown tunnels in Scotland, which used to serve as fuel tanks for the Royal Navy. There are no doors that lead to the tunnels, so Cox had to enter through 18-inch wide oil pipes.

Trevor Cox’s guide fired blanks from a pistol a third of the way into the oil storage tank. Cox captured the sound and was surprised to discover the world’s longest echo, hear it below:

[soundcloud url=”″ params=”color=ff6600&auto_play=false&show_artwork=true” width=”100%” height=”166″ iframe=”true” /]

Images by RCAHMS.

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Comments (4)
  1. Graeme Sacks

    Surely it should be the world’s longest “reverb” and not “echo”?

  2. Jughead

    I feel stupid for having read and listened to this. I could have been doing something useful.

    1. Jeff Stewart

      even stupider……. you have now wasted your time commenting that you have wasted your time!!

  3. Danwriter

    But if Roy Halee had recorded it, it would be considered genius.


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