A DILAPIDATED, fly-infestedfishing boat now moored off Yau Ma Tei is coming under intense police and diplomatic scrutiny following intelligence reports from Singapore that it is set to take Chinese illegal immigrants to North America. Detectives from the Organised Crime and Triad Bureau raided the 150-tonne EIYU 1 last week, scouring its wood-lined holds for bunks and looking for any sign of its Hongkong agent. Inquiries are continuing, although last week's search turned up nothing. Diplomatic sources said the ship had been linked with an international human-smuggling syndicate running a fleet of up to 15 ships, including the ill-fated East Wood, whose cargo of Chinese illegal immigrants were forced home from the Marshall Islands inMarch. The Honduras-registered ship limped into Hongkong without a cargo this month after breaking down on its way from Singapore to Taiwan. Its Indonesian crew left the territory soon after, forcing the owner's Hongkong representative, known to police only as Mr Hung, to arrange three watchmen to live on the ship at its mooring. The three watchmen said yesterday they knew nothing of the ship other than it was under ''great suspicion'' and had no fishing equipment on board. Winches and conveyor belts on the ship's decks were rusted up while huge tropical flies lined every surface, living off leaking stacks of tinned fish and noodles. The warm, dark hold can only be entered through a single opening and appears to be freshly lined with wood. ''We have been hired day-to-day through a man we know as Hung and we don't want to sign any contracts,'' one of the men said. ''If we don't get money each day, we won't work. Living like this we don't ask too many questions.'' The ship's engine is now in pieces. Application for port clearance has been filed with the Marine Department, whose surveyors are expected to inspect the ship this week.