In a desire to get a working submersible to the Titanic wreck site as fast as possible, the Titan was built at a risk to safety, with cost-cutting measures and poor engineering permitted by CEO Stockton Rush,

The company's former operations director, David Lochridge, testified that the Occupational Safety and Health Administration received his complaint, but did not pursue concerns about the submersible's safety.

An ex-employee at OceanGate had some scathing remarks during a U.S. Coast Guard investigatory hearing this week.

A key employee who labeled a doomed experimental submersible unsafe prior to its last, fatal voyage testified Tuesday that the tragedy could have been prevented if a federal safety agency had investigated his complaint.