Rescue efforts to find the missing Titanic submersible are entering their decisive hours . The vessel, named Titan, lost communication with tour operators on Sunday, June 18, while about 435 miles south of St John's in Newfoundland, during a voyage to the Titanic shipwreck off the coast of Canada.
On board the Titanic sub is the British billionaire adventurer Hamish Harding as well as UK-based businessman Shahzada Dawood, his son Suleman Dawood, and OceanGate's chief executive and founder Stockton Rush, reportedly with French submersible pilot Paul-Henri Nargeolet.
Rescuers are searching an area 2.5-miles below the surface of the sea. The temperatures are freezing cold and it is too deep for light to penetrate. In these pitch black conditions, it is easy to hit the ocean floor suddenly as subs have only a limited field of vision from their lights.
