Five men, including one teenager, have been declared dead days after they left for a voyage in a 22-foot submersible to see the wreckage of the Titanic in the North Atlantic Ocean. 

OceanGate, the company that hosted the mission on the Titan submersible to the Titanic, said Thursday that the entire crew – including its founder and CEO who was the pilot in the mission – were “lost at sea.” The U.S. Coast Guard also announced Thursday that rescue teams had found debris from the ship on the ocean floor “consistent with catastrophic loss of the pressure chamber.” 

The passengers were well known for their devotion to extreme exploration, desire to collect artifacts from the Titanic or their exorbitant wealth. Each paid $250,000 to ride on the submersible. The Coast Guard said families of the men had been notified of their deaths.

“These men were true explorers who shared a distinct spirit of adventure, and a deep passion for exploring and protecting the world’s oceans. Our hearts are with these five souls and every member of their families during this tragic time,” OceanGate said in a statement Thursday.

Rear Admiral John Mauger of the U.S. Coast Guard said during a press conference Thursday he did not know whether the Coast Guard would be able to recover the bodies. 

“This is an incredibly unforgiving environment down there on the seafloor,” he said.

For live updates on this disaster, read USA TODAY’s live blog here. The passengers on the sub were:

OceanGate’s CEO Stockton Rush

Stockton Rush, 61, founded OceanGate in 2009. He was also the co-founder of OceanGate Foundation, a non-profit organization “which aims to catalyze emerging marine technology to further discoveries in marine science, history, and archaeology,” according to the company’s website.