Titanic sub: What are the key challenges in the search mission?

A submersible vessel taking five tourists on a deep ocean journey to view the wreckage of the Titanic went missing on Sunday, triggering an enormous search and rescue effort.
Here is a look at the situation as rescuers race against time to search an area about half the size of Belgium for the submersible, which could be on the ocean floor or bobbing on the surface, with the tourists bolted in from the outside.
On Tuesday at 17:00 GMT, experts estimated the submersible had about 40 hours of breathable air left, which means rescuers have a little more than 20 hours to find the missing vessel.
If rescuers do find the submersible – they will need different equipment to save those on board.

Al Jazeera's Colin Baker has more on that.


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