door to door. However, the ports in Hvalba and Sandur would need to be extended in order to accommodate MS Smyril. Project The calls for a fixed link to Suðuroy emerged after the success of the two earliest sub-sea tunnels in the Faroe Islands, the Vágatunnilin and Norðoyatunnilin in 2002 and 2006 respectively. The Suðuroyartunnilin was first referred to officially in the National Transport Plan for 2008-2020, stating no concrete ambitions. The project was given more attention in the National Transport Plan 2012-2024, estimating an investment of 8 million DKK for a 22.5 km tunnel from Dalur to Sandvík, but again without concrete ambitions. The idea has gained more public attention since the onset of the construction of the Eysturoyartunnilin (opened in December 2020) and Sandoyartunnilin (to open in December 2023). The National Transport Plan for 2018-2030 lists the Suðuroyartunnilin again as an opportunity but no concrete plans to construct it. It recommends building the link in two sections, first from Sandoy to Skúvoy as a tunnel, bridge or causeway, and then onward to Suðuroy. It expected the costs to range from 2.8 to 3.4 million DKK, with an opening date of no earlier than 2030. The plan suggests a projected ridership of circa 1,000 vehicles per day in 2030. In 2019, Landsverk estimated ridership to be 800 motor vehicles per direction per day in 2030. In October 2021, public works authority Landsverk published a preliminary cost–benefit analysis scenario study that calculated the net present value for four tunnel options and two ferry options. This report was later published in English as Removing the Island Barrier. The expected ridership was now between 1,050 and 1,300 vehicles per day per direction, depending on the toll levels. The scenario study lists the following options: The total investment cost of a tunnel, excluding connecting roads would range from 3.6 to 5.4 billion DKK, corresponding roughly to one-quarter of the Faroese gross national income. At most 10% of the total costs could be recovered via tolls. Projected daily ridership for both directions combined ranges from 1,060 (option 5) to 1,370 motor vehicles per day (option 3).Parameters included in the analysis were operational costs, write-off (ferry Smyril), substitution effects, user prices (tolls or ferry tickets), demographic effects, employment effects, inflation and increase of wages, carbon dioxide emissions (during construction and operation) and the volume of debris generated in tunnel construction. As for option 5, the