The Hoehn Mk III folboats stored in the "Mustika" were deployed to make the party's way to Merapas. Using these folboats, Lyon led a small force of six other men—Lieutenant Commander Donald Davidson, Lieutenant Bobby Ross, Able Seaman Andrew Huston, Corporal Clair Stewart, Corporal Archie Campbell and Private Douglas Warne—into Singapore Harbour, where they are believed to have sunk three ships. Lyon and twelve others were killed in action soon afterwards, and the remaining ten men were captured and later executed by beheading in July 1945.