Faroe Islands, picture by J.Hinds (Unsplash)

An 11km undersea tunnel connects Streymoy and Eysturoy, the two biggest of the Faroe Islands. The tunnel features the world’s first undersea roundabout, with light effects designed by local artist Tróndur Patursson: it shortens travel time from 74 minutes to 16 between Tórshavn on Streymoy (the capital of the Islands), and the port-village of Runavók on Eysturoy. The project was developed by ‘Eystur-og Sandoyartunlar’, a company set up by the ‘County Council of the Faroe Islands’, and was built by Swedish contractor NCC using a combination of drilling and blasting. Work on the tunnel was affected by the poor quality of the rock, so much so that it required considerably more injection than was typical for the other tunnels constructed on the Faroe Islands since the 1960s. The archipelago now hosts a total of 19 tunnels, two of which are subsea tunnels built by NCC in the early 2000s. Read more: GCR