| Paul-Henri Nargeolet was an American deep-sea explorer of French descent. | 
| He was a renowned expert on the Titanic. | 
| On June 18, 2023, Nargeolet and four others perished when the submersible Titan imploded near the Titanic wreckage in the North Atlantic Ocean. | 
| He grew up in Casablanca, North Africa. | 
| At 16, he moved to Paris for higher education. | 
| Nargeolet's love for the sea began early, experiencing wreck diving at age nine. | 
| In September 1964, he began his service in the French Navy in various roles. | 
| In the 1970s, he led a team specializing in submerged mine detection and neutralization. | 
| He was instrumental in expeditions recovering sunken aircraft and shipwrecks. | 
| After retiring from the French Navy, he ventured into deep-sea exploration focusing on the Titanic. | 
| Nargeolet led multiple missions to explore and document the Titanic wreck site. | 
| Beyond the Titanic, he discovered various marine wreckages, including La Lune. | 
| Nargeolet directed deep diving equipment at IFREMER after the French Navy. | 
| He collaborated with Aqua+ in underwater film production and operations. | 
| From 2004 to 2007, he provided consultancy services in underwater exploration. | 
| In 2007, RMS Titanic, Inc. sought his expertise to locate the RMS Carpathia wreck. | 
| He oversaw retrieving artifacts from the Titanic wreck with RMS Titanic, Inc. | 
| In 2010, he contributed to creating a comprehensive 3D map of the Titanic wreck site. | 
| Nargeolet was involved in the search for the Air France Flight 447 flight recorder. | 
| In June 2023, he embarked on his final Titanic expedition, tragically leading to his passing. | 
| He directed Michigan State University's CMURM from 2015 to 2016. | 
| He authored "Dans les profondeurs du Titanic" in April 2022, documenting his expeditions. | 
| Nargeolet participated in creating two Titanic documentaries. | 
| His last exploration aboard the Titan ended in tragedy in June 2023. | 
| Nargeolet's daughter emphasized his profound love for underwater expeditions. | 
| Before his passing, he resided in Charleston, West Virginia. |