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

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 scientific director of OceanGate testified Thursday that the private company's sub Titan malfunctioned days before the failed mission in 2023 that ended in an implosion, claiming the lives of five crew and passengers on a trip to the sunken Titanic.