The longest undersea subway tunnel in China passes through: the group of people 88 meters under the sea.

"Bang ..." 1 On the morning of October 6, 20 18 165438, 88 meters below the sea level at the mouth of Jiaozhou Bay in Qingdao, Shandong Province, with the last gunshot, the deepest subsea tunnel in China-the subsea tunnel of Qingdao Metro1Line was officially opened, which was also built by China.

▲ Qingdao Metro 1 Line subsea tunnel section

The total length of Qingdao Metro 1 line subsea tunnel is 8. 1 km, of which the subsea section of the tunnel is 3.49 km. The longitudinal slope of the line is V-shaped, and the deepest part is 88 meters away from the sea level, which is equivalent to bearing the weight of 300 vehicles per linear meter of the tunnel. At the same time, the geology of the subsea tunnel is complicated, * * * crosses the 18 fracture zone and is directly connected with seawater, so there is a great risk of collapse, water gushing and water inrush in the construction process.

At the moment of blasting, Wang Zhanhai couldn't help crying. Chief engineer of Qingdao Metro 1 Line Project Management Department of China Railway 18th Bureau has not been home for three Spring Festival.

▲ Wang Zhanhai stood at the entrance of inclined shaft. Image source: Red Star News

Difficult! Crossing the 18 fault zone, the sun shines on the sea and the tide beats the reef. Standing at Tuandao, the southernmost tip of the main city of Qingdao, looking west, a ship slowly passed by the mouth of Jiaozhou Bay. Under the great ship, 1 1 the fresh water injected by the river meets the yellow sea water, and all the sediment is deposited on the seabed more than 40 meters deep.

▲ Jiaozhou Bay Estuary Image Source: Red Star News

At one end of the cross-harbour tunnel, roaring trucks transport the stone and muck buried for hundreds of millions of years to the project department of China Railway 18th Bureau located in Tuandao, where they will see the light of day again. "Bridges and roads are built for virtue." Wang Zhanhai said, pointing to these stones.