sentences:  During the 70s the French Dubegion-Normandie shipyard in Nantes had been Silja Line's shipyard of choice, with both previous generations of ferries for the Helsinki–Stockholm service built there.However for the new ships, the decision was made to build them in Finland at Wärtsilä Turku shipyards, that was at the time building several large ferries for Silja's main rival Viking Line.Externally the new ships were quite typical ferries of the early 1980s, with large boxlike superstructures.