OceanGates Expeditions, which owns the Titanic Submersible, now believes all five passengers aboard the missing submersible are dead.

The five were on an expedition to explore the wreckage of the Titanic. Titanic, which sunk in 1912 and killed over 1,500 passengers, lies 3.8 kilometers below the surface of the Atlantic Ocean.

“We now believe that our CEO Stockton Rush, Shahzada Dawood, and his son Suleman Dawood, Hamish Harding, and Paul-Henri Nargeolet have sadly been lost. These men were true explorers who shared a distinct spirit of adventure and a deep passion for exploring and protecting the world’s oceans.” OceanGate stated.

The ill-fated journey was OceanGate Expeditions’ third annual voyage, a sought-after but extremely expensive trip.

The vessel began the two-and-a-half-hour descent to the famous wreckage early Sunday when it suddenly lost contact with its mother ship, the Polar Prince, just an hour and 45 minutes into the journey.

The U.S. Coast Guard said that debris from the craft was found on the ocean floor on Thursday, about 1,600 feet from the bow of the Titanic

Here are the top positions held by the passengers who were aboard the sub.

Stockton Rush

He was the founder and Chief Executive Officer (CEO) of OceanGate, the company running the expedition, and was the sub’s pilot.

Rush founded the company in 2009, and his duties involved overseeing the company’s financial and engineering strategies.

According to his biography at OceanGate, he was the youngest person to become a jet transport-rated pilot when he earned a DC-8 Type/Captain’s rating at the United Airlines Jet Training Institute at 19.

He is a bachelor’s degree holder in aerospace engineering and an MBA from the Berkeley Haas School of Business

Shahzada Dawood and his son, Suleman Dawood

According to the New York Times, Dawood was the vice chairman of Engro Corporation, a business conglomerate in Karachi, Pakistan, that is involved in agriculture, energy, and telecommunications.

He is a master’s degree holder in global textile marketing from Philadelphia University in the U.S. and a law degree from Buckingham University in the U.K.

Suleman Dawood was 19 years old and was a science fiction fan. He was a business student at the University of Strathclyde in Glasgow and had just completed his first year.

Hamish Harding

Harding was a British businessman, pilot, explorer, adventurer, and space tourist. He was the founder and chairman of Action Aviation, an international aircraft brokerage company based in the United Arab Emirates (UAE), Dubai.

He is considered one of the wealthiest businessmen, although he misses in the Forbes magazine’s list of the world’s richest people.

Paul-Henri Nargeolet

Before his expeditions to the famous wreckage site in the Atlantic Ocean, Nargeolet served in the French Navy for over two decades, earning him the nickname “Mr. Titanic” among his admirers.

He was the director of underwater research for the RMS Titanic. He possesses a deep understanding of the ship’s history and has appeared in various films and programs dedicated to the disaster