Officials revealed on Friday that technical problems causing the drifting of an artificial island to house facilities for the troubled Hong Kong-Zhuhai-Macau bridge mega project were more serious than what the public had thought. Of the 22 huge steel cells used to fix seawalls around the island, most had drifted three to five metres while two had shifted by more than six metres and would have to be remedied, the Highways Department said. The maximum movement of the island was seven metres, as revealed in September. Director of Highways Peter Lau Ka-keung, however, was confident the HK$117 billion bridge would be finished by the end of 2017.