Canadian military intelligence and the Royal Canadian Mounted Police (RCMP) intercepted mail addressed to several "Kriegsmarine" officers (including Otto Kretschmer) imprisoned at the Camp 30 prisoner of war camp at Bowmanville, Ontario in early 1943. The correspondence detailed an escape plan in which the prisoners were to tunnel out of the camp and make their way (using currency and false documents provided for them) through eastern Ontario and across Quebec to the northeastern tip of New Brunswick off the Pointe de Maisonnette lighthouse where the escapees would be retrieved by a U-boat.