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.

David Lochridge, a former director of marine exploration for OceanGate who expressed safety concerns about the ill-fated Titan submersible, said Tuesday that company culture was centered on “making money” and “very little in the way of science.