Four men slipped aboard in the darkness. Armed with knives and moving fast, they descended into the engine room of the Taipan as the Marshall Islands-flagged tanker threaded its way through the Singapore Strait on the night of April 22. The crew managed to raise the alarm in time and thankfully no one was hurt. But by the time the vessel was searched the intruders were gone, vanished back into the water with a clutch of spare engine parts in tow. It was a modest haul. It was also the 16th such..