In April 1912, the RMS Titanic collided with an iceberg and sunk. The dramatic event has inspired years of conjecture and speculation; numerous conflicting theories about concerning how and why the Titanic plunged into the depths.

In August 2005, a History Channel expedition to Titanic, led by John Chatterton and Richie Kohler, found two huge intact sections of the ship’s bottom, the original red paint still on them. Based on preliminary analysis of these pieces, a panel of experts, which was led by naval architect Roger Long, concluded that the world famous vessel broke apart earlier in its sinking than has previously been thought.

Our team swiftly set out to find out why. As Roger Long continued his painstaking analysis, he unearthed compelling evidence indicating that Titanic may have had a previously unknown design flaw.

In summer 2006, John Chatterton and Richie Kohler intended to return to the wreck in order to search for additional evidence that would confirm or deny Roger Long’s hypothesis. However, the mission was thwarted when their research vessel was suddenly recalled by the Russian government.

The team was forced to regroup. Chatterton and Kohler decided to head to Greece to dive Titanic’s lost sister ship, the Britannic. In the search for clues, Roger Long was able to delve ever deeper into Titanic's design using the latest computerised structural analysis.

This groundbreaking programme will comprehensively examine the hypothesis that Titanic had a fatal design flaw, and that the Britannic was quietly modified in order to correct the problem. As the History Channel team continues its work, the answers emerge slowly from the murky depths of the Mediterranean Sea.