The submersible carrying five people to the wreck of the Titanic suddenly imploded, but why did this tragedy happen?
The US Coast Guard said yesterday the debris found by search crews in the Atlantic was parts of the submarine on the deadly expedition and the remainders serve as proof that the hull suffered a catastrophic implosion.
As tributes pour for the five crew who died in the accident, questions remain unanswered on what caused the Titan to implode.
