The Jian Seng was an 80-metre tanker and ghost ship of unknown origin that was spotted drifting 180 km south-west of Weipa, Queensland in the Gulf of Carpentaria by an Australian Coastwatch aeroplane in 2006. The ship was found inoperable and with no crew on board and a broken tow rope, with identifying marks removed, but no signs of illegal activity or violence. The coast guard was never able to determine the ship's origins, and scuttled it in deep waters.