Titanic firm submersible missing.
A submersible that takes tourists to the Titanic shipwreck has gone missing off the North American coast in the Atlantic.
The operator, OceanGate, says it's exploring and mobilising "all options to bring the crew back safely"
The Boston Coastguard tells the BBC a search operation for the submersible is under way.
It is not known how many people are on board - or precisely where the vessel is.
Small submersibles occasionally take paying tourists to visit the wreck of the Titanic.
The wreck sits around 3,800m (12,500ft) below sea level at the bottom of the ocean.
It is located around 600km (370 miles) off the coast of Newfoundland, Canada.
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