Here are a more dificult one i think, i can say this ferry have 2 sisters the oldes one was sabotashed from the Norwegian militery under the 2th world war cos the german shud not get heavy water, but watt are this ferrys name
She have a sister called Ammonia and the ferry that sank was Hydro, well now i maybe helped to mutsh, and i have sailed with here many times a great ship/ferry now it's only a turist ferry ore a museum, not in ordenery traffic, so watt are the name on the first ferry, tips google and the last ship had a importen transpotation for the germans under the world war 2
good luck