THERE is no sign of anyone aboard an 80-metre “ghost ship” found floating in Australian waters, Customs officials say.? The tanker, Jian Seng, was about 180km south-west of Weipa in the Gulf of Carpentaria when Customs officers boarded it yesterday morning. There was no sign of recent human activity aboard, nor any signs it had been engaged in illegal fishing or people smuggling. Customs believes the vessel was under tow when it broke free and was subsequently abandoned. It is believed the ship has been adrift for at least a week.