Italian Auxiliary Ship Olterra - Last Mission

Last Mission

On 25 July, Mussolini was removed from power, a clear signal that Italy was on the brink of collapse. The course of the war and the political changes were no deterrent for the Decima MAS, which continued to plan and execute attacks on Allied shipping in all fronts. On 10 June, the unit was awarded the Medaglia d’oro as a tribute to their deeds. On the night of 3 August 1943, the Ursa Maior carried out the last operation against the "Rock". Again, three craft left the Olterra in search of their targets: three transport ships at anchor in the bay. Notari led the "pigs" close to the Spanish coast to avoid the searchlights aimed at open sea. His second man was Petty Officer Giannoli, whose training on piloted torpedoes was poor. While the crew was clamping the explosive charge to the keel of a Liberty ship, their torpedo spun out of control. Notari opened the diving valves, and the "pig" suddenly crash dived to a depth of 34 meters. Then, the craft surfaced just a few feet from their intended victim. Half conscious and with no trace of his companion, Notari tried to fix the mechanical problems developed by his torpedo, but the diving mechanism was disabled. At the end, he managed to sneak out at full speed, helped by a flock of porpoises which covered his wake. Giannoli was left behind. After waiting two hours on the rudder of the ship, he shouted for help. Once Giannoli was taken on board, a motor launch carrying a member of Crabb’s diving unit was called to the scene. There was little doubt that the ship, the American Harrison Grey Otis had been mined. The warhead blew up just seconds before the British diver, Petty Officer Bell, could put his foot on the water. One sailor died and eight others were seriously injured. Like her sister ship Pat Harrison in May, the 7,700 tn Otis was declared a constructive total loss. Two other Allied ships were also rocked by explosions at the same time, about 4:00 am of 4 August. The Norwegian Thorshøvdi, of 9,900 tn was broken in two by the blast, while the British Stanridge (6,000 tons) sank in shallow water. The last mission of the Ursa Major destroyed 23,000 tn of Allied shipping.

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