Article Title: Canada military probes mysterious Arctic pinging noise

Snippet of Article: "...A spokesman in the department of national defence in Ottawa said the cause of the pinging noise - which locals say can even be heard through the hulls of boats - remains a mystery. The sound, sometimes also described as a "hum" or a "beep", has been heard throughout the summer in Fury and Hecla Strait ..."

Article Source: www.bbc.com