Today an encore presentation of an episode that last aired on November 26th. Ottawa has been studying whether Canada should purchase up to a dozen submarines to help protect Canada's Arctic. It's a program that would cost dozens of billions of dollars. Is it worth it? What is the history of subs in the Arctic? Who's been there, and who hasn't? The answers may surprise you. Our guest is historian and author, Professor Adam Lajeunesse of ST FX University in Nova Scotia.