Missing Titanic sub passenger belongs to same Explorers Club as Jeff Bezos, Josh Gates, astronaut Buzz Aldrin

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Titanic sub is missing in 'most hostile environment you can imagine': G Michael Harris

Friends of Titan submersible passengers G. Michael Harris, Aaron Newman, and Tom Dettweiler discuss the search for the missing submarine on 'The Story.'

Hamish Harding, one of five passengers who are on board the missing Titanic tourist submersible, belongs to an international society of adventurers that includes Amazon founder Jeff Bezos, famed astronaut Buzz Aldrin, and veteran explorer Josh Gates. 

Harding, a British millionaire, known for his exploratory escapades across the globe, is a founding member of the Board of Trustees of The Explorers Club. A resident of Dubai, he also chairs the club’s Middle East Chapter. 

FILE: In this photo provided by Blue Origin, NS-21 (New Shepard-21), astronaut Hamish Harding receives his Blue Origin astronaut pin after a successful flight to space on June 4, 2022, in Van Horn, Texas.  (Felix Kunze/Blue Origin via AP)

According to its website, the Explorers Club "has been supporting scientific expeditions of all disciplines, and uniting our members in the bonds of good fellowship for over a century." 

The club’s president, Richard Garriott de Cayeux, wrote online that he had spoken with Hamish last week at the Global Exploration Summit and his excitement about the upcoming expedition was "palpable." 

‘BANGING’ NOISES CONFIRMED IN DESPERATE DEEP-SEA SEARCH FOR MISSING TITAN SUB BUT SOURCE UNKNOWN

"I know he was looking forward to conducting research at the site," Garriott de Cayeux said. "We all join in the fervent hope that the submersible is located as quickly as possible and the crew is safe."

Harding, 58, is renowned for his lofty travel ambitions, with a resume including a record-setting circumnavigation of the Earth, an Antarctic expedition with Apollo 11 astronaut Buzz Aldrin, and a seat aboard the fifth human flight of Blue Origin's New Shepard rocket last year.

Jannicke Mikkelsen and missing Titanic submersible passenger Hamish Harding. (Fox & Friends/Screengrab)

Fellow Explorers Club member Jeff Gates, who hosts a TV series, revealed on Twitter Wednesday that the missing OceanGate sub "did not perform well" when he went on a dive aboard the vessel himself. 

Other passengers on board the missing submersible include French explorer and Titanic expert Paul-Henry Nargeolet, OceanGate CEO Stockton Rush, Pakistani billionaire Shahzada Dawood, and his son, Suleman.

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Rescuers on Wednesday rushed more ships and vessels to the area where a submersible disappeared on its way to the Titanic wreckage site, hoping underwater sounds they detected for a second straight day might help narrow their search in an increasingly urgent mission.

The pilot of a Royal Canadian Air Force CP-140 Aurora maritime surveillance aircraft of 14 Wing flies a search pattern for the missing OceanGate submersible, which had been carrying five people to explore the wreck of the sunken SS Titanic, in the Atlantic Ocean off Newfoundland, Canada June 20, 2023, in a still image from video. (Canadian Forces/Handout via REUTERS  )

Crews were scouring an area twice the size of Connecticut in waters 2 1/2 miles deep, said Captain Jamie Frederick of the First Coast Guard District, who noted that authorities are still holding out hope of saving the five passengers onboard the Titan.

"This is a search and rescue mission, 100%," he said. "... We'll continue to put every available asset that we have in an effort to find the Titan and the crew members."

This image provided by the Woods Hole Oceanographic Institution shows the bow of the Titanic 12,500 feet (3.8 kilometers) below the surface of the ocean, 400 miles (640 kilometers) off the coast of Newfoundland, Canada in 1986. Rare and in some cases never before publicly seen video of the dive is being released on Wednesday, Feb. 15, 2023, by the Woods Hole Oceanographic Institution. (Woods Hole Oceanographic Institution via AP)

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But even those who expressed optimism warned that many obstacles remain: from pinpointing the vessel's location, to reaching it with rescue equipment, to bringing it to the surface — assuming it's still intact. And all that has to happen before the passengers' oxygen supply runs out, which some have estimated might happen as early as Thursday morning.

Fox News’ Michael Ruiz and The Associated Press contributed to this report.