"Windsor" performed a 105-day training cruise in 2015, making it the longest deployment by a "Victoria"-class submarine. The submarine participated in training exercises with NATO and several navies in the North Atlantic. During the cruise, "Windsor" was deployed to track five submarines from another nation that had entered the North Atlantic. Canada announced plans for a major life extension for the class on 7 April 2015, possibly to start in 2020. The estimated cost for the program would be between $1.5 and $2 billion CAN.