During Operation Jaywick, limpet mines were fastened to seven ships in Singapore Harbour, by Commandos launched from the Special Services vessel HMAS KRAIT. The largest ship attacked was the 10,000 ton tanker SINKOKU MARU. An estimated 37,000 to 39,000 tons of enemy shipping was sunk or damaged. All three parties returned safely to the rendezvous at Dongas Island. Major I. Lyon recorded in his journal a tense moment in the operation: “Halfway through the work, (attaching the mines to the ship’s hull), Huston drew my attention to a man watching us intently from a porthole ten feet above. Just before we left he withdrew his head. The alarm was not sounded.”
The Fremantle based USS BONEFISH, (submarine), sank the Japanese troop ship KASHIMA MARU in the South China Sea.