The sinking of the Titanic in April 1912 was a tragedy unlike any other. Surely it could never happen again? But it did. In the wake of the Titanic disaster, its sister ship Britannic was re-engineered to be even stronger. And yet, on the 21st of November 1916, she sank in just 55 minutes - 3 times faster than the Titanic. It's one of Britain's greatest untold disaster stories.
