Jiugong Tunnel  The Jiugong Tunnel () or Siwei Tunnel () is a tunnel in Lieyu Township, Kinmen County, Taiwan. The tunnel is located on a coastal area at the southeast of Lieyu Island. It is located in a reef of granite mountain. The tunnel was constructed in a twin T-shape with four exits. It spans over a length of 790 meters and a height of 11.5 meters.