During lockdown in London, Ash Clivery is troubled by a mystery sound. On the other side of the world, across the bay from the city of Vancouver, Glen MacPherson has been tracking occurrences of the sound for a decade.

The World Hum Map and Database Project

https://www.thehum.info/

This episode was recorded, produced and sound designed by Tom Whalley

It was made by Tbone Productions.

Music courtesy of Epidemic Sound.

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