What is tunel drogden?

The Drogden Tunnel is a 4,050-meter (13,290 ft) long immersed tunnel that carries the E20 highway under the Drogden Strait between Denmark and Sweden. It's a crucial component of the Øresund Line, which also includes the Øresund Bridge. It connects Copenhagen on the Danish island of Amager with Malmö in Sweden. The tunnel consists of pre-fabricated concrete sections that were lowered into place and then joined together. It emerges on the artificial island of Peberholm, which then connects to the bridge.