threat of Japanese air and submarine attack. At midnight on 22 June 1943, the unit left Magnetic Island and paddled by folboat through the heavily mined mouth of Townsville Harbour. Dummy limpet mines were attached to ten ships, including two destroyers. The men rowed into Ross Creek, dismantled and hid their folboats, then travelled into Townsville to find a place to sleep. Around 10:00 am, the limpets were discovered, and panic ensued. Carey was arrested, and despite producing Blamey's letter and earnest assurances that the mines were dummies, they refused to allow him to leave or to allow the removal of the mines, which the RAN feared were real and might accidentally detonate. Mott was able to arrange Carey's release, but only on the condition that he left Z Special Unit. Operation Scorpion was scrapped due to a lack of submarine transport, but Mott and Lyon had learned many valuable lessons from the raid. Operation Jaywick Operation Jaywick was an Inter-Allied Services Department operation to infiltrate the Japanese-occupied Singapore Harbour and destroy shipping. On 2 September 1943, the Krait, with a crew of eleven Australian and four British personnel, left Exmouth Gulf, Western Australia. The group, commanded by Ivan Lyon, dyed their skin brown and hair black (the skin dye later caused many skin problems for the members of the team, including irritation and reactions in adverse amounts of sunlight). They also wore sarongs, so that they resembled Indonesian fisherman. They arrived off Singapore on 24 September and that night six men left the boat. They paddled to a small island near the harbour where a forward base was established in a cave. On the night of 26 September, using folboats the party paddled into the harbour and placed limpet mines on several Japanese ships. The mines sank or seriously damaged four Japanese ships, amounting to over 39,000 tons. The raiders waited until the commotion had died down before returning to the Krait. On 19 October the Krait arrived back at Exmouth Gulf having achieved a great success. Operation Rimau Operation Rimau was a follow-up to the successful Operation Jaywick, which had taken place in 1943, being a further attack on Japanese shipping at Singapore Harbour. Rimau (Malay for "tiger") was again led by Lieutenant Colonel Ivan Lyon, a British officer on secondment from the Gordon Highlanders. Originally named Operation Hornbill, the goal of "Rimau" was to sink Japanese shipping