'Banging sounds heard' during Titanic tourist sub search, US media reports

This photo provided by OceanGate Expeditions shows a submersible vessel named Titan used to visit the wreckage site of the Titanic. © OceanGate Expeditions via AP

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.

News of the banging sounds was first reported by Rolling Stone.