Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. HMCS Corner Brook (SSK 878) is a long-range hunter-killer submarine (SSK) of the Canadian Navy. She is the former Royal Navy Upholder class submarine HMS Ursula (S42), purchased from the British at the end of the Cold War. She is the third ship of the Victoria class and named after the city of Corner Brook, Newfoundland.