Titan submersible hearing LIVE: Day 4 of testimony after panel hears of malfunction and discord

Another mission specialist who worked with the company that owned the Titan submersible that imploded last year while on its way to the Titanic wreckage testifies before a U.S. Coast Guard investigatory panel.
The investigatory panel has listened to three days of testimony that raised questions about the company's operations before the doomed mission.
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