Banging sounds were detected during the search for the missing Titanic submersible, a US memo says, as oxygen supplies dwindle and the search intensifies

Banging sounds were picked up Tuesday from the Atlantic Ocean during the search for the submersible that went missing while touring the Titanic’s wreckage with five people on board, signaling “continued hope of survivors,” according to a US government memo, as crews rush to ramp up search and recovery efforts. 

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