Canada investigates mysterious ‘pinging’ sound at bottom of sea in Arctic Prison Planet.com Posted on November 4, 2016 Posted in Aggregated No Comments Tagged with Sci Tech London Telegraph | Canada’s military is investigating a mysterious “pinging” that is emanating from the sea floor in the Arctic. 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