U.S. Coast Guard hears testimony about the doomed Titan submersible

We heard new and emotional testimony today during a U.S. Coast Guard hearing about the doomed Titan submersible. The Titan imploded last year as it descended to the site of the Titanic wreckage. Five people aboard were killed. There's also newly-released footage showing the debris from that implosion on the ocean floor. NBC News' Jesse Kirsch reports.