An 18-kilometre tunnel will soon link southern Denmark with northern Germany beneath the Baltic Sea. When it opens in 2029, the ambitious immersed road and rail link will be the longest of its kind worldwide, slashing travel times for tourists and commuters between the two countries. As construction gets underway, Euronews Travel speaks with the team behind the Fehmarnbelt tunnel to find out more. How will the Fehmarnbelt tunnel benefit travellers?Currently, travelling between the Danish island of Lolland and the German isle of Fehmarn involves a 45-minute ferry ride. Connecting Rødbyhavn on t…