It is said that "History is written by the victor" which perhaps explains why so little is known about the Wilhelm Gustloff which was deliberately sunk with three torpedoes by a Russian submarine in the icy waters of the Baltic Sea on the 30th of January 1945. Almost 10,000 civilian refugees, of which more than half were infants and childen, perished in this deadliest of all single-ship disasters.
You can read more about it on the Wilhelm Gustloff website.