Underwater microphones designed to spot enemy submarines first heard what the U.S. Navy suspected was the Titan submersible implosion hours after the submersible began its voyage, officials involved in the search said. Officials said the discovery played a role in narrowing the scope of the search for the vessel before its debris was discovered. 📷: OceanGate, CTV, AP, U.S. Coast Guard, Getty #titan #submersible #titanic #navy #wsj #wallstreetjournal #thewallstreetjournal | [according to U.S. defense officials] | [according to officials involved in the search] | U.S. Navy heard what it believed was Titan sub implosion days ago