On October 2, at a depth of 105 meters below sea level in Jiaozhou Bay, as the “National Signal” shield cutter reached the demarcation distance, the final prefabricated pipe section was installed in place, and the tunnel shield excavation was completed.

On October 2, at a depth of 105 meters below sea level in Jiaozhou Bay, as the “National Signal” shield cutter reached the demarcation distance, the final prefabricated pipe section was installed in place, and the tunnel shield excavation was completed.