Question: The ship MS Vistafjord has what in service for NAL?
SQL: SELECT "In service for NAL" FROM "2-1852658-1" WHERE "Ship" = 'MS Vistafjord';

Question: The ship SSBergensfjord built before 1973 has what tonnage?
SQL: SELECT "Tonnage" FROM "2-1852658-1" WHERE "Built" < 1973.0 AND "Ship" = 'SSBergensfjord';