There’s a low industrial hum hanging in the air in Port Morien, Cape Breton, Nova Scotia. It cuts through walls and windows, sinks into bedrooms and keeps people up at night. For over five years now, that droning noise has been the background to daily life in the small coastal communities around the Donkin underground subsea coal mine. The Donkin coal mine on a map. The Donkin mine, with tunnels extending beneath the Atlantic Ocean, has been plagued by safety issues and envir