The Coast Guard's Marine Board of Investigation heard from more than two dozen witnesses, including several former employees of OceanGate.

Karl Stanley, the owner of the Honduras-based deep-sea diving expedition company, testified on Tuesday during the U.S. Coast Guard hearing on the Titan implosion.

Friday marked the last day of testimony in the U.S. Coast Guard Marine Board of Investigation's two-week hearing into the June 2023 implosion of OceanGate's Titan sub.

Justin Jackson, a materials engineer with NASA, testified Thursday during the U.S. Coast Guard's hearing into the June 2023 implosion of the OceanGate submersible.

Don Kramer, the acting chief of the NTSB's materials laboratory, testified during the U.S. Coast Guard's hearing into the June 2023 implosion.

Guillermo Sohnlein co-founded OceanGate with Stockton Rush, one of the five people killed when the company's Titan sub catastrophically imploded in June 2023.

A man who went on two OceanGate deep-sea dives to see the Titanic testified that he understood the risk and he could die if something went wrong.

A witness got emotional recounting the day of the doomed Titan submersible dive while testifying during the U.S. Coast Guard's hearing into the deadly implosion.

David Lochridge, the former director of marine operations for OceanGate, said he was known as a "troublemaker" in the company because he was so outspoken.

One of the last messages sent from the doomed Titan submersible during its June 2023 voyage to the Titanic wreckage was "all good here," the Coast Guard said.

The estate of a Titanic researcher who was among the five people killed when the Titan submersible catastrophically imploded has filed a wrongful death lawsuit.

The investigation into the ill-fated Titan submersible's dive to the location of the Titanic will now take longer than expected, according to the U.S. Coast Guard.

Entrepreneur Larry Connor said this week that he and Triton Submarines CEO Patrick Lahey are planning their own deep-sea expedition in a submersible.

A former employee warned company executives about the inefficiency of their hull design and the company's testing methods.

The Titanic has intrigued the public from the moment it tragically crashed into an iceberg in the Atlantic Ocean and sank on April 15, 1912.

OceanGate said it is suspending all exploration and commercial operations after five people were killed during its expedition to the Titanic wreckage.

Debris from the submersible that catastrophically imploded while on a voyage to see the Titanic wreckage last week was brought ashore Wednesday morning.

While the recovery operation and investigation remains ongoing, here's what we know about the situation and how it unfolded.

Liability waivers "are not automatically enforceable," one expert said of a potential case against the submersible company.

The Navy used a Cold-War-era sonar system to detect and locate the sound's origin.

Titan victims' deaths ‘brought the world together,’ uncle says.

The company behind the missing Titanic tourist submersible exaggerated the details of the industry partnerships behind its titan submersible.

The Coast Guard policy is not to ask for a refund from private operators.

Here's what we know about the crew of the OceanGate sub.

James Cameron has compared the tragic loss of the submersible Titan to the very thing that may have led the Titanic to its own demise.

The five-person submersible suffered an implosion, a Coast Guard official said.

Despite their onboard oxygen tank expected to be depleted sometime Thursday morning, the five people aboard the lost Titanic tourist sub could survive for hours.

U.S. Coast Guard officials conceded crews are facing a daunting investigation to determine what caused the Titan submersible to implode underwater.

OcenaGat founder and CEO Stockton Rush is among the passengers on the missing vessel.

The submersible reported missing miles off the coast of Cape Cod was an unorthodox vessel with a relatively unproven history, according to company materials and experts.

Retired Navy Capt. David Marquet, a former submarine commander, spoke with ABC News about the risks to rescue the lost tour submersible.

Mike Reiss, who has done four, 10-hour dives with OceanGate, including one to the Titanic, told ABC News his sub lost contact with the host ship on every dive.

Venturing 13,000 feet under the sea to see the wreckage of the Titanic is a dangerous endeavor as a former ABC science editor knows all too well

A submersible has gone missing while on a tour of the wreckage of the Titanic off the coast of Newfoundland, Canada.

The vessel, made of carbon fiber, was reported overdue by OceanGate Inc. on Sunday, prompting a Coast Guard search effort for the massive submersible.