destroyer dropped 19 depth charges, which shattered light bulbs and came close to damaging the submarine. Later, a submarine chaser dropped 27 depth charges wide of the target. Upholder withdrew to Malta on the 8 July. On 19 July Upholder left harbour once more, to take part in Operation Substance, which was a supply operation to deliver a much-needed convoy to the island. Wanklyn was moved to guard the south island of Marettimo. Two days later Wanklyn moved to San Vito Lo Capo, on the western tip of Sicily. There, he could cover enemy movements from Palermo. On 24 July he spotted and engaged a transport with a single destroyer escort. He dived and fired three torpedoes at 5,000 yards, one of which struck and his victim, the 5,000-ton Dandolo sank. The destroyer dropped 17 depth charges over two hours and attempted a hydrophone hunt, but Wanklyn dived to 150 feet and retired to the north-west. His score now stood at 67,000 tons of enemy shipping sunk. On 28 July, while in thick fog north of Marettimo, Wanklyn's spotters saw two cruisers supported by destroyers. The escorts were zig-zagging on either side while the cruiser maintained a steady course. It was identified as the Giuseppe Garibaldi, travelling at high speed—the asdic gave a reading of 230 revs indicating 28 knots. Wanklyn had to think quickly if he was not to miss his chance. At 4,000 yards he fired a spread of four 35-knot Mark IV torpedoes at 12-second intervals. The submarine dived and the crew clearly heard two explosions. The Garibaldi stopped as her escorts created a smoke screen and dropped depth charges for 45 minutes. The officers of Upholder counted 38. The presence of the escorts and smoke denied the British the chance to assess the results of the attack. Upholder returned to Malta and learned that the operation had been a success. As the summer progressed, British submariners had noticed how vulnerable Italian coastal railway networks were. On 15 August 1941 Wanklyn and Upholder sailed to the Marittimo area with the hope of landing saboteurs—or train wrecking parties—along the coast to plant explosives along coastal railways. British submarines were now carrying out these operations regularly. Over the closing months of 1941, 12 such operations were carried out. On one occasion a submarine surfaced and shot up a locomotive with its deck gun. Once in the area, Wanklyn was