Last year, five people hoping to view the Titanic wreckage died when their submersible imploded in the Atlantic Ocean. This week, a Coast Guard panel that's investigating the Titan disaster listened to four days of testimony that has raised serious questions about whether warning signs were ignored.

The Titan submersible had to abort a dive just days before the implosion that killed its five passengers as they explored the wreck of the Titanic, an ex-employee of the company that operated the vessel testified on Thursday.

A paying passenger described an aborted dive due to a mechanical failure, while OceanGate employees described a cutlure that prized profits over safety.

After a 24-hour break, the Coast Guard’s hearing into why a submersible set to explore the Titanic imploded has resumed Thursday. Witnesses scheduled to testify include Renata Rojas, a former passenger,