Did Titanic have a fatal design flaw? This was the question naval architect Roger Long posed after Deep Sea Detectives John Chatterton and Richie Kohler discovered new evidence at Titanic's grave in 2005.

An expedition looks into whether Titanic's hull had a construction design flaw that caused her to break apart. Featuring advanced CGI technology, archive documents and photographs, as well as footage from the modern-day History(R) expeditions, "Titanic's Achilles Heel" is a remarkable journey into the ongoing legacy of a ship that continues to capture the world's attention.