Titan sub disaster: Five key questions that remain

RMS Titanic / GettyThe Titan sub was on a trip to see the wreck of the TitanicIt was the submersible that promised passengers the trip of a lifetime. A chance to descend 3,800m (12,500ft) to the Atlantic depths to visit the wreck of the Titanic.But last year, a dive by Oceangate’s Titan sub went tragically wrong. The vessel suffered a catastrophic failure as it neared the sea floor, killing all five people…