The crew on board the Titan sub knew that it was about to implode, $50M lawsuit says

• The family of a French explorer killed on the Titan sub is suing OceanGate for over $50 million.
• Paul-Henri Nargeolet died alongside four other people last year when the submersible imploded.
• The suit claims the "crew were well aware they were going to die, before dying."

The crew of the ill-fated Titan submersible, a new lawsuit says, knew that the vehicle was about to implode during its descent and suffered "terror and mental anguish."

The allegation was made by the family of the French explorer Paul-Henri Nargeolet, who was killed on the sub last year. His family is suing OceanGate , the estate of its CEO, Stockton Rush, and others for more than $50 million.

OceanGate's dive to the Titanic shipwreck on June 18, 2023, killed all five people on board . The sub is believed to have imploded within hours of its descent, which raised concerns about OceanGate's approach to innovation and safety.

The lawsuit says the implosion was the result of the "carelessness, recklessness and negligence" of OceanGate, Rush, and others.

The Titan sub "dropped weights" a little over an hour into its dive, the suit says, adding that indicates the team had attempted to terminate the expedition. "Common sense dictates that the crew were well aware they were going to die, before dying," the lawsuit says.

It adds: "The crew may well have heard the carbon fiber's crackling noise grow more intense as the weight of the water pressed on Titan's hull.

"The crew lost communications and perhaps power as well. By experts' reckoning, they would have continued to descend, in full knowledge of the vessel's irreversible failures, experiencing terror and mental anguish prior to the Titan ultimately imploding."

Nargeolet, nicknamed Mr. Titanic, was hired to help OceanGate during the Titan's trip. But the wrongful-death suit claims that he was misled.

"Mr. Rush confessed to a 'mission specialist' on one Titanic voyage that he had 'gotten the carbon fiber used to make the Titan at a big discount from Boeing because it was past its shelf life for use in airplanes,'" the lawsuit, which was filed Tuesday in King County, Washington, says.

Nargeolet had participated in 37 dives to the wreckage of the Titanic , which the court filing says is the most of any diver in the world. His dives included part of the first expedition to the Titanic in 1987, shortly after its location was discovered.

The court documents describe Rush as an "eccentric and self-styled 'innovator'" who had an "obsession with being remembered for 'innovation' alongside such luminaries as Steve Jobs and Elon Musk."

They also referred to instances such as OceanGate's firing of David Lockridge, which The New Yorker reported came after he raised concerns about the submersible's safety and the fact that the Titan deviated from the industry standard of using titanium for its hull.

"TITAN was and remains the only submersible ever produced with a carbon-fiber hull," the suit says.

OceanGate's chief engineer, Tony Nissen, was specifically called out for allegedly hiring a "2017 graduate and having six or fewer years' of relevant work experience" as the lead electrical engineer on the project.

The company has suspended all exploration and commercial operations since the tragedy.

The clerk's office of the King County Superior Court has set the first trial date for August 2025.

Tony Buzbee, one of the attorneys on the case, told Business Insider: "We are hopeful that through this lawsuit we can get answers for the family as to exactly how this happened, who all were involved, and how those involved could allow this to happen."

Matt Shaffer, another attorney representing the Nargeolet family, said: "We have alleged in the lawsuit that had Stockton Rush (OceanGate's CEO and founder) been transparent about all the troubles that had been experienced with the Titan, as well as the previous, similar models, someone as experienced and knowledgeable as Paul Henri-Nargeolet would not have participated.

"The filing asserts that Stockton Rush simply wasn't forthcoming with the crew and passengers about the dangers he and others knew about but the passengers and crew did not."

OceanGate declined to comment for this story.