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Canada will have to squeeze at least another decade of life out of its used British submarines as it waits for Germany to deliver up to 12 new vessels. But not everyone’s convinced that can be done. The four diesel-electric subs the Royal Canadian Navy acquired from Britain in the late 1990s have been plagued with disasters, including floods, a deadly fire and a grounding that took the only operational sub we have right now out of action for a decade. But the recent announcement that Canada is negotiating with Thyssenkrupp Marine Systems as the preferred supplier for up to 12 new subs...