The Latest Breaking News from CNN

NEW YORK: Search teams detected underwater sounds while scanning the North Atlantic for a tourist submersible that vanished with five people aboard during a deep-sea voyage to the century-old wreck of the Titanic, the United States Coast Guard said early on Wednesday.

Banging sounds were heard during the search for the Titan submersible on Tuesday, CNN reported, citing an internal government memo. Other acoustic feedback was heard and "will assist in vectoring surface assets and also indicating continued hope of survivors", according to CNN.

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Here is what we know so far about the missing 22ft long vessel and those on board, including the British billionaire adventurer Hamish Harding.