 In 1986, "Jane's Fighting Ships" recorded that the average cost for this class was £200 million at 1984–85 prices.In 1987, the Canadian White Paper on Defence recommended the purchase of 10 to 12 - or "Trafalgar"-class submarines under technology transfer, with the choice of the type of submarine due to be confirmed before summer 1988.The goal was to build up a three-ocean navy and to assert Canadian sovereignty over Arctic waters.