Qingdao's second undersea tunnel under Jiaozhou Bay surpasses 3,000-meter mark

Photo taken on December 15 shows that a key milestone has been achieved in the construction of Qingdao's Second Tunnel under Jiaozhou Bay, with the tunneling segment of the project's southbound main tunnel exceeding 3,000 meters ahead of schedule. The tunnel spans a total length of 17.48 kilometers. Its underwater section stretches 9.95 kilometers, making it the world's longest undersea road tunnel currently under construction. Designed for a speed of 80 kilometers per hour, the tunnel will serve as a crucial transport artery linking Qingdao's main urban area with the West Coast New Area upon completion. (Photo by Zhang Jingang)

Photo taken on December 15 shows that a key milestone has been achieved in the construction of Qingdao's Second Tunnel under Jiaozhou Bay, with the tunneling segment of the project's southbound main tunnel exceeding 3,000 meters ahead of schedule. The tunnel spans a total length of 17.48 kilometers. Its underwater section stretches 9.95 kilometers, making it the world's longest undersea road tunnel currently under construction. Designed for a speed of 80 kilometers per hour, the tunnel will serve as a crucial transport artery linking Qingdao's main urban area with the West Coast New Area upon completion. (Photo by Zhang Jingang)

Photo taken on December 15 shows that a key milestone has been achieved in the construction of Qingdao's Second Tunnel under Jiaozhou Bay, with the tunneling segment of the project's southbound main tunnel exceeding 3,000 meters ahead of schedule. The tunnel spans a total length of 17.48 kilometers. Its underwater section stretches 9.95 kilometers, making it the world's longest undersea road tunnel currently under construction. Designed for a speed of 80 kilometers per hour, the tunnel will serve as a crucial transport artery linking Qingdao's main urban area with the West Coast New Area upon completion. (Photo by Zhang Jingang)

Photo taken on December 15 shows that a key milestone has been achieved in the construction of Qingdao's Second Tunnel under Jiaozhou Bay, with the tunneling segment of the project's southbound main tunnel exceeding 3,000 meters ahead of schedule. The tunnel spans a total length of 17.48 kilometers. Its underwater section stretches 9.95 kilometers, making it the world's longest undersea road tunnel currently under construction. Designed for a speed of 80 kilometers per hour, the tunnel will serve as a crucial transport artery linking Qingdao's main urban area with the West Coast New Area upon completion. (Photo by Zhang Jingang)