Tromsøysund Tunnel
The Tromsøysund Tunnel is a road tunnel in Norway. It goes under the sea and connects the island of Tromsøya with the mainland. It is part of a big road called European route E08. The tunnel has two sections and each section has two lanes for cars. One tube is 3,500 meters long and the other is 3,386 meters long. The tunnel goes down to 102 meters below sea level.