Just returned from a week-long stint diving the Bell Island Mine in Newfoundland for a TV movie... after a seven-year absence the mine is as beautiful and interesting as ever. My thoughts on opening it to "tourist divers" is outlined in the link below.
https://decodoppler.wordpress.com/2015/10/11/adventure-tourism-under-the-bell/
https://decodoppler.wordpress.com/2015/10/11/adventure-tourism-under-the-bell/