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The United States Coast Guard says a missing submersible imploded near the wreckage of the Titanic, killing all five people on board.

Coast Guard officials said during a news conference Thursday that they鈥檝e notified the families of the crew of the Titan, which has been missing for several days. Debris found during the search for the vessel 鈥渋s consistent with a catastrophic implosion of the vessel,鈥� said Rear Adm. John Mauger of the First Coast Guard District.

鈥淭he outpouring of support in this highly complex search operation has been great[ly] appreciated. Our most heartfelt condolences go out to the friends and loved ones of the crew,鈥� Mr. Mauger said.

OceanGate Expeditions said in a statement that all five people on board, including company CEO and pilot Stockton Rush, were believed dead. Mr. Rush, Pakistani businessman Shahzada Dawood, and his son Suleman Dawood, British adventurer Hamish Harding, and French explorer and Titanic expert Paul-Henri Nargeolet 鈥渉ave sadly been lost,鈥� OceanGate said in a statement.

OceanGate did not provide details when the company announced the 鈥渓oss of life鈥� in a statement or how officials knew the crew members perished. The Titan鈥檚 96-hour oxygen supply likely ended early Thursday.

OceanGate has been chronicling the Titanic鈥檚 decay and the underwater ecosystem around it via yearly voyages since 2021.

The Titan was estimated to have about a four-day supply of breathable air when it launched Sunday morning in the North Atlantic 鈥� but experts emphasized that was an imprecise approximation to begin with and could be extended if passengers took measures to conserve breathable air.聽

Rescuers have rushed ships, planes, and other equipment to the site of the disappearance. On Thursday, the U.S. Coast Guard said an undersea robot sent by a Canadian ship had reached the sea floor, while a French research institute said a deep-diving robot with cameras, lights, and arms also joined the operation.

Authorities had been hoping underwater sounds might help narrow their search, whose coverage area was expanded to thousands of miles 鈥� twice the size of Connecticut and in waters 2 1/2 miles deep. Coast Guard officials said underwater noises were detected in the search area Tuesday and Wednesday.

The Titan was reported overdue Sunday afternoon about 435 miles south of St. John鈥檚, Newfoundland, as it was on its way to where the iconic ocean liner sank more than a century ago.聽By Thursday morning, hope was running out that anyone on board the vessel would be found alive.

Dr. Rob Larter, a marine geophysicist with the British Antarctic Survey, emphasized the difficulty of finding something the size of the submersible, which is about 22 feet long and 9 feet high.

鈥淵ou鈥檙e talking about totally dark environments,鈥� in which an object several dozen feet away can be missed, he said. 鈥淚t鈥檚 just a needle in a haystack situation unless you鈥檝e got a pretty precise location.鈥�

At least 46 people successfully traveled on OceanGate鈥檚 submersible to the Titanic wreck site in 2021 and 2022, according to letters the company filed with a U.S. District Court in Norfolk, Virginia, that oversees matters involving the Titanic shipwreck.

But newly uncovered allegations suggest there had been significant warnings made about vessel safety during the submersible鈥檚 development.

One of the company鈥檚 first customers characterized a dive he made to the site two years ago as a 鈥渒amikaze operation.鈥�

鈥淚magine a metal tube a few meters long with a sheet of metal for a floor. You can鈥檛 stand. You can鈥檛 kneel. Everyone is sitting close to or on top of each other,鈥� said Arthur Loibl, a retired businessman and adventurer from Germany. 鈥淵ou can鈥檛 be claustrophobic.鈥�

During the 2 陆-hour descent and ascent, the lights were turned off to conserve energy, he said, with the only illumination coming from a fluorescent glow stick.聽The dive was repeatedly delayed to fix a problem with the battery and the balancing weights. In total, the voyage took 10聽陆 hours.

The submersible had seven backup systems to return to the surface, including sandbags and lead pipes that drop off and an inflatable balloon.

Nick Rotker, who leads underwater research for the nonprofit research and development company MITRE, said the difficulty in searching for the Titan has underscored the U.S.鈥檚 need for more underwater robots and remotely operated underwater vehicles.

鈥淭he issue is, we don鈥檛 have a lot of capability or systems that can go to the depth this vessel was going to,鈥� Mr. Rotker said.

Nicolai Roterman, a deep-sea ecologist and lecturer in marine biology at the University of Portsmouth, England, said the disappearance of the Titan highlights the dangers and unknowns of deep-sea tourism.

鈥淓ven the most reliable technology can fail, and therefore accidents will happen. With the growth in deep-sea tourism, we must expect more incidents like this.鈥�

This story was reported by The Associated Press. AP writers Jon Gambrell in Dubai, United Arab Emirates; Ben Finley in Norfolk, Virginia; Frank Jordans in Berlin; Danica Kirka in London; and John Leicester in Paris contributed to this report.