Have you heard ‘the hum’? Mystery of Earth’s low droning noise could now be solved Prison Planet.com Posted on April 17, 2015 Posted in Aggregated No Comments Tagged with Sci Tech London Independent | It was often blamed on phone masts, submarine communications and pipes. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email