Titan submersible hearing begins as questions linger over what went wrong NBC NewsHearing Could Answer Key Questions About How Titan Submersible Imploded The New York TimesWATCH LIVE: World may get new answers on OceanGate’s imploded watercraft Fox NewsTitan sub disaster: Five key questions that remain BBC.comThe Coast Guard will hear from former OceanGate employees about the Titan implosion The Associated Press