During a public Coast Guard hearing on Monday, some unfortunate new details of the Titan submersible disaster have come to light. It's been 15 months since the tiny vessel took off to visit the Titanic shipwreck 12,

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.

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