The main structure of a tunnel linking the Puxi and Pudong zones of the 2010 World Expo is completed, as a massive shield finishes digging a second passage across the Huangpu River yesterday. Officials of the Shanghai No. 2 Engineering Co, which is building the Xizang Road S. Tunnel, plan to open the link before the end of June to construction vehicles working on World Expo projects. The tunnel, which will have two lanes in each passage, runs 2.67 kilometers and is designed to transport 60,000-70,000 vehicles an hour during the Expo.—Shanghai Daily