OceanGate founder and CEO Stockton Rush crashed a submersible into a shipwreck and then threw the vessel’s rudimentary controls at a more experienced employee years before he piloted the doomed Titan voyage last summer.

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 is testifying before a U.S. Coast Guard investigatory panel Friday.