The Øresund Bridge is an international cross-sea bridge, connecting the municipality of Copenhagen, the capital of Denmark, and Malmö, an industrial city in Sweden. It is a rare bridge in the world consisting of a bridge, an artificial island, and an undersea tunnel. The bridge was officially opened to traffic on July 1, 2000. It is 16 kilometers long. The undersea tunnel on the west side is 4,050 meters long, 38.8 meters wide, and 8.6 meters high. It is located 10 meters below the seabed and consists of 5 pipelines, which are two railway tracks, two two-lane highways, and an evacuation channel. It is currently the most spacious undersea tunnel in the world; the artificial island in the middle is 4,055 meters long, connecting the two sides of the project; the east cross-sea bridge is 7,845 meters long, with a 4-lane highway on the top and a railway track on the bottom. There are 51 bridge piers in total, and the cable-stayed bridge in the middle has a span of 490 meters and a height of 55 meters. It is currently the largest cable-stayed bridge built in the world. In the spring of the year before last, I took a car across the Øresund Bridge to Malmö. I could only experience the tunnel in the car and go on the bridge, but I couldn't see the whole view of the bridge because I was in the mountains. When I arrived in Malmö, I looked at the whole bridge from the side of the Øresund Strait. The water and the sky were gray and the bridge seemed like a floating line on the water.