A commercial submersible has gone missing near the site of wreck of the Titanic, Sky News understands.
It is not clear how many people, if any, were on board at the time it went missing.
It is understood that coastguards are looking for the vessel in the North Atlantic Ocean, where the ship sank.
Tourists sometimes pay to be taken to the wreckage of the liner – 12,500ft under water.
The Titanic famously sank into the Atlantic on 15 April 1912 during its maiden voyage from Southampton to New York after hitting an iceberg, with some 1,500 people dying in the disaster.
The wreck – discovered 37 years ago – is some 4,000m deep at the bottom of the Atlantic, about 400 nautical miles from Newfoundland in Canada.
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