There are 24 witnesses on the Coast Guard’s official list. Although some important players in the saga are expected to testify, experts have said key witnesses are missing from the list, including several OceanGate executives and representatives of the companies that built parts of the Titan. One witness’s testimony is sure to attract attention: David Lochridge, who raised serious concerns about the safety of the Titan’s design while he was employed as director of operations for OceanGate, is set to speak Tuesday. Lochridge was fired from OceanGate in 2018 and was sued by the company. Lochridge and OceanGate settled the lawsuit in 2018.