A former director of marine operations at OceanGate was fired in 2018 after raising critical safety concerns about the submersible Titan, but his retaliation complaint against the company was ignored by OSHA and Coast Guard investigators. The whistleblower report filed by the director failed to get traction, and he eventually withdrew his complaint due to the emotional toll of the legal battle.
Source: https://edition.cnn.com/us/live-news/oceangate-titan-submersible-report-08-05-25