OceanGate's Titan sub briefly became tangled up in the Titanic during a 2022 dive, according to a mission specialist who was on the dive.

The passenger testified that the mission was scrapped because the sub couldn't navigate, and was swimming in circles.

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