CTV News: 'The Canadian navy is on the hunt for a new system to defeat hostile torpedoes as it works to extend the life of its four Victoria-class submarines through the mid-2030s. In documents published last week, the Department of National Defence and Procurement Canada say advances in sonar technology and torpedo guidance systems have made anti-submarine torpedoes more effective than ever at overcoming decoys and other countermeasures. Canada's military submarines currently use small, three-inch beacons that have to be manually loaded and launched from either end of the boat to counter a torpedo threat.'