The sinking of the Titanic in April 1912 was a tragedy unlike any other. Surely it could never happen again? But it did. Incredibly, Titanic had a sister - Britannic - who suffered a near-identical fate. In the wake of the Titanic disaster, Britannic was re-engineered to be even stronger. And yet, on 21 November 1916, she sank in just 55 minutes - three times faster than Titanic. It's one... see more