Rescuers searching for a tourist submersible near the Titanic wreck in the North Atlantic have heard "noises" in the area near where the vessel went missing on Sunday.
According to the US Coast Guard, a Canadian P-3 aircraft heard the sounds, which US Navy experts are analysing.
Underwater operations have been relocated to explore the source.
But so far the remote operated vehicles have "yielded negative results", the Coast Guard said.
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