Titanic's Achilles HeelDid 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.

In August of 2005 John Chatterton and Richie Kohler (of Deep Sea Detectives) led an expedition to Titanic, where they discovered two huge intact sections of the ship's bottom, the red paint still on.

Naval architect Roger Long, along with a panel of experts concluded that Titanic broke apart earlier in its sinking than has been believed, due to a previously unknown design flaw.

Chatterton and Kohler return to the wreck in 2006 searching for evidence to support this theory, but when their research vessel is recalled by the Russian government they head to Greece to dive Titanic's lost sister ship Britannic. Was Britannic quietly modified to correct the problem?

This informative History Channel documentary takes an in-depth look at the circumstances surrounding the sinking of the Titanic in 1912, exploring a recent theory that the vessel was actually the victim of a flaw in its very engineering, which resulted in the famous disaster.

Watch the full documentary now