Pasteur was built by Penhot of St. Nazaire for the French Compagnie Sudatlantique. Her maiden voyage, scheduled for 10 September 1939, was cancelled due to the outbreak of World War II. After one Brest-Halifax trip with France's gold reserves, Pasteur entered service as a troop carrier in August 1940, under the British flag and Cunard White Star management. In June 1945, Pasteur returned to the French flag, and in early 1946 management was returned to Cie. Sudatlantique. After her World War II trooping duties, Pasteur was used to transport French troops to and from Indochina. Laid up in 1956, Pasteur was sold to NDL in September 1957 and was rebuilt by Bremer Vulkan. Renamed Bremen, she entered NDL service in July 1959, on the Bremerhaven-New York route. Her final Bremen-New York roundtrip for Hapag-Lloyd came in September 1971. Bremen was then sold to the Greek Chandris Line and renamed Regina Magna. In 1977, she became a Jeddah barracks ship for Philippine workers, called Saudiphil I. On 9 June 1980, while being towed to Taiwan for scrapping, turned on her port side and sank stern-first in the Indian Ocean.