The Suðuroyartunnilin (Suðuroy Tunnel) is a proposed submerged fixed-link in the Faroe Islands, linking the island of Suðuroy to Sandoy. Currently all vehicles and cargo, and virtually all passenger traffic must use the ferry service. Current situation At present, a ferry service operates between Krambatangi on central Suðuroy and the capital Tórshavn. The ferry is operated by the national transport company Strandfaraskip Landsins and uses the vessels Smyril (passengers and cargo) and Herhjólfur III (cargo), taking two hours and five minutes (Smyril) to three hours (Herhjólfur III) each way. In 2019, on average 1,000 passengers (including the drivers) and 290 vehicles embarked on the ferry per day. The frequency is either twice or three times per day, though the service is frequently cancelled in winter due to adverse weather and heavy seas, since the Suðuroyarfjørður strait is exposed to swell and strong tidal currents (with overfalls in places), and funnels northwesterlies. Currently another ferry links Skúvoy and Sandoy multiple trips per day, most of which need to be reserved in advance. If the Suðuroyartunnilin would route via Skúvoy, it would add Skúvoy to the road network and replace this passenger ferry service as well. Incidentally, the Suðuroyartunnilin would form a structural, direct link between Sandoy and Suðuroy - the two southern sýslur (districts) - for the first time in decades. Currently they are only marginally linked via a twice-weekly helicopter service, running the route Tórshavn-Skúvoy-Stóra Dímun-Froðba, which does not call at Sandoy itself. Landsverk constructed a new Hvalbiartunnil between Trongisvágur and Hvalba. This tunnel replaced the old tunnel from 1963. The old Hvalbiartunnilin was a bottleneck that needed to be solved for before Suðuroyartunnilin could become a reality. Also a replacement of the Sanvíkartunnilin, to the northernmost village Sandvík, is being considered for this reason. A new tunnel of 2.5 kilometres has an estimated cost of 219 million DKK. On Sandoy, the Sandoyartunnilin will open in December 2023 and connect Sandoy to Streymoy. This tunnel would act as a stepping stone for Suðuroy-bound traffic if the Suðuroyartunnilin becomes reality. In the meantime, the ferry MS Smyril may dock in Sandur instead of Tórshavn, and sail to Hvalba, as was expressed as a possibility by Strandfaraskip Landsins in 2023. This would reduce the crossing time to 1 hour and 15 minutes, thus allowing for increased frequency, and bringing travel times from Suðuroy to Tórshavn to a maximum of 2.5 hours from