Missing Titanic submersible live updates: Texts show OceanGate CEO dismissed concerns

Engro, the company sub passenger Shahzada Dawood worked as the vice chairman, offered its condolences for both Dawood and his son, Suleman Dawood, on Thursday.

"With heavy hearts and great sadness, we grieve the loss of our vice chairman, Shahzada Dawood, and his beloved son, Suleman Dawood," the company said in the message. "Our thoughts and prayers are with the Dawood family at this tragic time."

"We extend our heartfelt condolences to the family, colleagues, friends and all those around the world who grieve this unthinkable loss," it added.

-ABC News' Habibullah Khan

The submersible that catastrophically imploded while on a voyage to see the Titanic wreckage has highlighted a high-risk, experimental and exclusive tourism opportunity to see what is largely considered to be the most famous shipwreck of all time.

The doomed ocean liner has intrigued the public from the moment it tragically crashed into an iceberg in the Atlantic Ocean and sank on April 15, 1912 -- as well as throughout the century-plus since.

Visits to the underwater site have been conducted in recent decades to retrieve artifacts, study the Titanic's gradual decay and simply lay eyes on the storied shipwreck, which has inspired a wealth of novels, plays, TV shows and films.

"The Titanic has basically been in popular culture since the night it sank," Robert Thompson, founding director of the Bleier Center for Television and Popular Culture at Syracuse University, told ABC News.

Read more about the Titanic's long intrigue here.

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.

Read more here.

-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