The Melkøysund Tunnel is an underwater tunnel that connects the island of Melkøya with the mainland in Hammerfest. The tunnel was opened in 2005 and is part of the infrastructure that supports transport and communication in the region. It is approximately 6.5 kilometres long and goes down to a depth of 212 metres below sea level, making it one of the deepest underwater tunnels in Norway.
The tunnel has an important function for both passenger and freight transport, and it helps to connect local communities in the area. The Melkøysund Tunnel is also part of the E69, which is an important route for travellers wishing to visit the North Cape and other attractions in Finnmark. The construction of the tunnel has made it possible to reduce travel time between Melkøya and the mainland, which has had positive effects on both business and tourism in the region.