Secrets of the Lost Liners

Mapping the zigzagging path of a floating palace as it ferries U.S. troops to Europe during World War II; witnessing her smooth transition to peacetime cruise ship and mourning her disastrous end after she was sold to a Hong Kong shipping tycoon.

Hollywood stars flocked to this sleek, stylish vessel, making it the envy of other shipping lines; learning why her high-tech navigation equipment failed to alert her to another ship that was on a catastrophic collision course.

The pride and joy of Benito Mussolini's fleet, which was once the fastest liner on the Atlantic; discovering why she was never turned into a troop ship during the war, but remained a target for the Allies, who sank her after Italy surrendered.

The German flagship Cap Arcona served as the set for the 1942 Nazi propaganda feature film "Titanic"; her end would be equally tragic, with an even greater loss of life.

Two women designers construct one of the longest-serving liners in history; the dramatic shipwreck in the Canary Islands.