The scientific director for the company that owned the Titan submersible that imploded last year while on its way to the Titanic wreckage testified that the sub had malfunctioned just prior to the fatal dive.

OceanGate’s former scientific director, Steven Ross, testified that passengers were “tumbling about” during the malfunction, with one left “hanging upside down” after the sub collided with bulkheads. He added that he was unsure if the Titan’s hull was inspected for damage afterward.