SS Irma was a 1,322-ton steamship built by the British shipyard Sir Raylton Dixon & Co. Ltd. in Middlesbrough in the north-east of England. She was delivered to the Norwegian passenger ship company Det Bergenske Dampskibsselskab of Bergen in 1905. Irma sailed for the company until she was attacked and sunk by two MTBs belonging to the Royal Norwegian Navy on 13 February 1944.

SS Sanct Svithun was a 1,376 ton steel-hulled steamship built by the German shipyard Danziger Werft and delivered to the Norwegian Stavanger-based shipping company Det Stavangerske Dampskibsselskab on 1 July 1927. She sailed the Hurtigruten route along the coast of Norway until she was lost in an air attack on 30 September 1943 during the Second World War.