A submersible used to take people to view the wreck of the Titanic has gone missing in the Atlantic Ocean, sparking a search and rescue mission.
The Boston Coastguard told the BBC on Monday that an operation to find it was under way.
It is not clear how many people, if any, were on board at the time it went missing.
Small submersibles occasionally take paying tourists and experts to view the wreck of the Titanic.
Multi day trips to the wreck cost tens of thousands of dollars and one dive to Titanic, including both the descent and the ascent, reportedly takes around eight hours.
Read more at BBC.com