The five people aboard a missing submersible are thought to be dead, according to the company that owns the vessel, bringing a grim end on Thursday to the massive search for the vessel that was lost during a voyage to the Titanic.

“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 Expeditions said in a statement. “Our hearts are with these five souls and every member of their families during this tragic time.”

The company leading the Titan submersible trip says the five missing crew members are believed to be dead.

OceanGate Expeditions on Thursday says its pilot and chief executive Stockton Rush, along with passengers Shahzada Dawood and his son Suleman Dawood, Hamish Harding, and Paul-Henri Nargeolet “have sadly been lost.”

OceanGate did not provide details Thursday when the company announced the “loss of life” in a statement or how officials knew the crew members perished.

The vessel’s 96-hour oxygen supply likely ended early Thursday.

The company has been chronicling the Titanic’s decay and the underwater ecosystem around it via yearly voyages since 2021.

The search for a missing submersible with five people aboard took a bleak turn Thursday when the U.S. Coast Guard said a debris field was found at the bottom of the ocean near the Titanic, and the critical 96-hour mark passed when breathable air could have run out.