Missing Titanic submersible live updates: Texts show OceanGate CEO dismissed concerns
Five people, including the company CEO, were aboard the sub when it imploded.
All passengers are believed to be lost after a desperate dayslong search for a submersible carrying five people that vanished while on a tour of the Titanic wreckage off the coast of Newfoundland, Canada.
The 21-foot deep-sea vessel, operated by OceanGate Expeditions, lost contact about an hour and 45 minutes after submerging on Sunday morning with a 96-hour oxygen supply. That amount of breathable air was forecast to run out on Thursday morning, according to the United States Coast Guard, which was coordinating the multinational search and rescue efforts.
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- Sub's carbon-fiber composite hull was the 'critical failure,' James Cameron says
- Probe seeks answers on why Titanic sub imploded
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- All lives believed to be lost: OceanGate
Hamish Harding remembered as 'passionate explorer'
Hamish Harding, a British businessman who was among the five people killed in the Titan implosion, was remembered as a "passionate explorer" by his loved ones.
"Hamish Harding was a loving husband to his wife and a dedicated father to his two sons, whom he loved deeply," a statement sent on behalf of his family and Action Aviation, the company he chaired, said. "To his team in Action Aviation, he was a guide, an inspiration, a support, and a Living Legend."
"He was one of a kind and we adored him. He was a passionate explorer -- whatever the terrain -- who lived his life for his family, his business and for the next adventure," the statement continued. "What he achieved in his lifetime was truly remarkable and if we can take any small consolation from this tragedy, it's that we lost him doing what he loved."
-ABC News' Mark Guarino
Explorer Robert Ballard on 'extremely powerful' implosion
Explorer Robert Ballard, who was on the 1985 expedition that discovered the Titanic wreckage and has made many dives since, reacted to news of the implosion with ABC News on Thursday.
"It's very tragic what happened, I know the people that passed away," he said, adding that he's known OceanGate CEO Stockton Rush, who was piloting the vessel, for 20 years. "I know this was his dream, so my heart goes out to him and his family and the families of all the people who lost loved ones."
Ballard surmised the crew likely experienced difficulties and began to drop weights to ascend to the surface but "never made it."
"If you're on your way up and you're buoyant and you don't make it, it's a catastrophic implosion," he said.
"I don't think people can appreciate the amazing energy involved in the destructive process of an implosion," Ballard continued. "It just takes and literally shreds everything. So it's extremely powerful."
Explorers Club remembers lost crew
The Explorers Club reacted to news of the submersible's implosion, saying in a letter to members on Thursday: "Our hearts are broken."
President Richard Garriott de Cayeux noted that two of the passengers lost in the implosion -- Hamish Harding and Paul-Henri Nargeolet -- were members of the Explorers Club, while OceanGate CEO Stockton Rush was a friend of the society who had conducted lectures at its headquarters.
"Hamish Harding is a dear friend to me personally and to The Explorers Club," Garriott de Cayeux said. "He holds several world records and has continued to push dragons off maps both in person and through supporting expeditions and worthy causes."
Nargeolet was "one of the foremost experts on submersible expeditions to the Titanic," Garriott de Cayeux said.
"They were both drawn to explore, like so many of us, and did so in the name of meaningful science for the betterment of mankind," he continued. "They pushed themselves in their entrepreneurial pursuits as they did in exploration."
James Cameron calls OceanGate's carbon-fiber hull 'fundamentally flawed'
In reacting to news of the OceanGate submersible implosion, "Titanic" director James Cameron told ABC News that he was "struck by the similarity of the Titanic disaster itself, where the captain was repeatedly warned about ice ahead of his ship and yet he steamed at full speed into an ice field."
Cameron, who has built his own submersible, was critical of OceanGate's use of a carbon-fiber hull, calling it "fundamentally flawed."
OceanGate CEO Stockton Rush, who was among the five passengers killed on the submersible, had previously said he believed a sub made with carbon fiber would have a better strength-to-buoyancy ratio than titanium.
US Coast Guard commander talks search for missing sub
The United States Coast Guard commander leading the search for a missing submersible off the coast of Newfoundland, Canada, said Tuesday morning that crews in multiple aircraft have flown over an area of the Atlantic Ocean "roughly about the size of Connecticut" while "looking for any signs of surfacing."
"As we continue on with the search, we're expanding our capabilities to be able to search under the water as well," Rear Adm. John Mauger, commander of the First Coast Guard District, told ABC News' Robin Roberts during an interview on "Good Morning America."
A commercial vessel with remotely operated vehicles is now on scene that will allow rescuers to search underwater, according to Mauger.
"This is a complex case," he added. "The Coast Guard doesn't have all the resources to be able to affect this kind of rescue, although this is an area that's within our search zone."
In many cases, Mauger said, the Coast Guard's role is to coordinate all of the assets and technical expertise that can be used in a search, in addition to operating aircraft or ships when necessary.
"In this particular case, we've established a unified command with the United States Navy, with the Canadian Armed Forces, with the Canadian Coast Guard and with the private operator OceanGate Expeditions to make sure that we understand what's needed and deploy all available equipment to the scene that could be used to locate this submersible, whether it's on the surface or down beneath the surface," he said.
Crews have been working "around the clock" to locate the deep-sea vessel since it lost contact with its operator on Sunday morning, according to Mauger.
In the last 24 hours, a Canadian aircraft has been dropping sonar buoys into the water that can pick up sound the submersible may be emitting. Vessels that have the capability to listen with their own sonar equipment are also on scene, according to Mauger.
"If they are making sound, that's certainly one of the ways that we're going to use to locate them," he said.