This is interesting, but how did the telescopic system work? that allowed them to provision themselves at sea? Perhaps it means provision 'air' in reference to the schnorkel.
"U-boats did not return to Canadian waters until 1944, when the Allied armies were poised to invade Germany itself. The average life of a U-boat was only three missions, so the crews were always eager to find easy targets. The submarines were equipped with a snorckel, a telescopic system allowing them to provision themselves at sea and recharge their batteries without having to surface. Using this system, the U-1223 entered the St. Lawrence undetected, seriously damaged the frigate HMCS Magog on October 14 and sunk the Canadian freighter SS Fort Thompson on November 2. Three weeks later, in Cabot Strait, the U-1228 torpedoed the corvette HMCS Shawinigan, making it the last victim of the Battle of the St. Lawrence. These German attacks, though very limited, momentarily reawakened the fears experienced two years before. In May 1945, the U-boat menace finally came to an end when the U-889 and U-190 surrendered to the Canadian Navy, at Shelburne, Nova Scotia and Bay Bulls, Newfoundland."
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