Titanic tourist submersible: Rescuers scan ocean as clock ticks
Search teams are racing against time to find a submersible that went missing during a dive to the Titanic's wreck.
Five people were on board when contact with the small tourist sub was lost about an hour and 45 minutes into its dive on Sunday.
The rescue operation has continued overnight in the mid-Atlantic but so far there has been no sign of it.
The five on board include British businessman Hamish Harding, and father and son Shahzada and Suleman Dawood.
As of Monday afternoon, the US coast guard said...