Rescue effort is continuing in the North Atlantic after a submersible exploring the wreck of the Titanic went missing
A massive search and rescue effort is continuing in the North Atlantic after a submersible exploring the wreck of the Titanic went missing deep under the ocean on Sunday. There are five people on board, BBC reports.

Researchers aboard the Polar Prince - its mothership on the surface - lost contact with the crew shortly after the Titan began its dive. There is limited oxygen on board, and it is estimated that supplies are set to run out by around 10:00 GMT (06:00 EDT) on Thursday.
Banging noises have now been detected in the search area, but it is not known where they are coming from or what they mean.
US, Canadian and French agencies are working together to locate the submersible, and the tour firm says it is exploring all options to get it back safety. Here is what we know so far.
A Canadian search plane has picked up underwater noises. Deep-sea experts say it is hard to determine what these noises might be without seeing the data. But it is possible they could be short, sharp, relatively high frequency noises - made from within the vessel by hitting a hard object against the end of the sub.
The US Coast Guard has sent ROVs - remotely operated vehicles - to search under the surface in that area. You can read more about the equipment being used in our visual guide.
Planes are continuing to search from the air, in case Titan has returned to the ocean's surface but somehow lost communications.