The exact whereabouts of the missing Titanic submersible and the condition of the five crew onboard are unknown.

It is thought that, if the vessel is still intact, it may have just a few hours of oxygen remaining, creating a race against time to find the sub before it is too late.

The search has been expanded, with aircraft and ships, as well as remotely operated vehicles, combing around 10,000 sq miles of ocean.

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