Rescue teams are in a race against time after a tourist submersible carrying five people went missing during a dive to the wreck of the Titanic.
The so-called Titan sub's air supply is expected to run out at around 11:00 BST on Thursday, and experts say finding and recovering the missing vessel will be exceedingly challenging.
But why is the sub so hard to find?
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Why The Titanic Sub Is So Hard To Find – BBC News For Country: United States. City: El Monte, Indianapolis, Jacksonville, North Las Vegas, Westminster
