Aug. 5 (UPI) -- The implosion of the OceanGate submersible Titan in 2023 was "preventable," because of its inadequate design and "toxic" workplace culture, according to a report released by the U.S. Coast Guard Tuesday.

The Titan imploded on June 18, 2023, killing five people. The 335-page report documented the causes of the implosion and listed 17 safety recommendations to strengthen oversight of submersible operations, improve coordination among federal agencies and close gaps in international maritime policy.

All five on the submersible were killed in the implosion. They were OceanGate's founder and CEO, Stockton Rush; British billionaire Hamish Harding; French maritime expert Paul-Henri Nargeolet; Pakistani businessman Shahzada Dawood and his 19-year-old son, Suleman Dawood.

"The two-year investigation has identified multiple contributing factors that led to this tragedy, providing valuable lessons learned to prevent a future occurrence," said Jason Neubauer, chair of the U.S. Coast Guard Marine Board of Investigation for the Titan. "There is a need for stronger oversight and clear options for operators who are exploring new concepts outside of the existing regulatory framework. I am optimistic the [Report of Investigation's] findings and recommendations will help improve awareness of the risks and the importance of proper oversight while still providing a pathway for innovation."