The company behind the submersible that imploded exaggerated the details of the industry partnerships behind the development and engineering of the underwater vessel.

In some public statements, OceanGate suggested the Titan -- its only vessel able to reach Titanic depths -- was designed and engineered with the assistance of entities such as Boeing, the University of Washington and the National Aeronautics and Space Administration. In statements to ABC News, each entity described its role, or lack thereof, as more limited than sometimes stated by OceanGate.

When asked about these exaggerations about the role of partnerships in the development of the Titan submersible, an OceanGate representative declined to comment on the matter.

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-ABC News' Peter Charalambous

U.S. Coast Guard officials conceded they are facing a daunting investigation to determine what caused the Titan submersible to implode underwater near the wreckage of the Titanic, killing all five explorers aboard.

Officials said the 21-foot-long Titan was found in pieces by a remotely operated vehicle on a smooth section of ocean floor more than 2 miles beneath the surface.

"This was an incredibly complex case and we're still working to develop details for the timeline involved with this casualty and the response," Mauger said.

Read more about the investigation here.

-ABC News' Bill Hutchinson

The Titan submersible suffered a "catastrophic implosion," the U.S. Coast Guard determined.

At the depth of the Titanic, which sits 3,800 meters below sea level, the pressure reaches a level 380 times the atmospheric pressure on the Earth's surface, Stefan Williams, a professor of marine robotics at the University of Sydney, said in a blog post on Tuesday.

A fault or failure in the hull of the Titan could have led to an implosion, as the vessel gave way to the high pressure of the deep sea, Williams said.

The implosion of a submersible delivers immense force, oceanographer Bob Ballard told ABC News on Thursday.

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-ABC News' Max Zahn

A senior U.S. Navy official confirmed to ABC News that an underwater acoustic detection system heard on Sunday what was likely the implosion of the Titan submersible. The information was immediately shared with the U.S. Coast Guard on Sunday and analysis continued afterwards.

"The U.S. Navy conducted an analysis of acoustic data and detected an anomaly consistent with an implosion or explosion in the general vicinity of where the Titan submersible was operating when communications were lost," the senior official told ABC News in a statement. "While not definitive, this information was immediately shared with the Incident Commander to assist with the ongoing search and rescue mission."

According to the official, "This information was considered with the compilation of additional acoustic data provided by other partners and the decision was made to continue our mission as a search and rescue and make every effort to save the lives on board.”

Separately, a U.S. defense official said an analysis of the “banging” noises picked up by sonar buoys were not from the missing submersible but were either natural ocean sounds, biological noises or noises associated with the surface response vessels.

-ABC News' Luis Martinez

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."