The Titan submersible's last known communication before its fatal implosion was a tragic message received by the Coast Guard.

• On Monday, the U.S. Coast Guard revealed the last message from the Titan's crew, which was "all good here," before the submersible's tragic implosion on June 18, 2023.
• For seven months prior to the incident, the Titan was exposed to the elements without being reviewed by third parties.
• The Marine Board of Investigation's hearing aims to determine the reasons for the Titan's collapse and prevent future disasters.

The last words heard from the crew of the experimental submersible before it sank were "all good here," as depicted in a visual reconstruction of the Titanic's journey before it sank, resulting in the deaths of all five crew members.

On Monday, the U.S. Coast Guard unveiled an animation as part of a two-week hearing into the causes of the Titan's implosion. The crew on the Titan were in contact with staff on the support ship Polar Prince via text messages, as per the presentation.

The crew lost contact with the submersible after an exchange of texts about its depth and weight as it descended. The Polar Prince then sent repeated messages asking if the Titan could still see the ship on its onboard display. One of Titan's final responses, which became spotty as it descended, was "all good here."

On June 18, 2023, the Titan imploded, sparking a global discussion about the future of private undersea exploration.

The Titan submersible was left exposed to the elements for seven months during storage in 2022 and 2023, according to Coast Guard representatives. Additionally, the hull was never reviewed by any third parties, which is standard procedure. The unconventional design of the Titan subjected it to intense scrutiny in the undersea exploration community.

On Monday, Tony Nissen, OceanGate's former engineering director, testified that he felt pressured to begin operations while with the company. When questioned about the pressure to launch the Titan, he replied with certainty, "100%."

The marine board inquired if Nissen believed that the pressure affected safety decisions and testing. Following a lengthy pause, he replied, "No. ... It's a challenging question to respond to because with infinite time and an unlimited budget, you could conduct an infinite amount of testing."

Nissen pointed out that the Titan was hit by lightning during a test mission in 2018, which may have weakened its hull. He was dismissed in 2019, the same year he refused to allow the submersible to explore the Titanic. Additionally, he stated that he had informed Rush that the Titan was not functioning as expected.

The engineering director stated that the submersible underwent additional tests and modifications before being used for dives to the Titanic. Nevertheless, he expressed his lack of trust in the operations staff and testified that when Stockton asked him to operate the submersible, he responded: "I won't be a part of it."

Nissen testified that Rush was difficult to work for and was always concerned with costs and project schedules. He said Rush would fight for what he wanted, which often changed day to day. Nissen added that he tried to keep his disagreements with Rush private to avoid causing problems for the company.

He stated that most individuals would eventually retreat to Stockton.

The highest level of marine casualty investigation conducted by the Coast Guard is the ongoing Marine Board of Investigation. Upon conclusion of the hearing, recommendations will be submitted to the Coast Guard's commandant. Additionally, the National Transportation Safety Board is conducting an investigation.

"Jason Neubauer of the Coast Guard Office of Investigations stated that there are no words to ease the loss experienced by the families affected by the tragic incident. However, he added that the hearing aims to shed light on the cause of the tragedy and prevent any similar incidents from occurring in the future."

The implosion resulted in the death of Stockton Rush, co-founder of OceanGate, a Washington state company that owned the Titan. The company subsequently halted its operations.

The company's former finance director, Bonnie Carl, and former contractor Tym Catterson were also scheduled to speak.

Wendy Rush, the communications director of OceanGate, and some other key representatives are not scheduled to testify.

The Coast Guard does not disclose the reasons for not inviting certain individuals to a hearing during ongoing investigations, according to Melissa Leake, a spokesperson for the Coast Guard. She explained that it's typical for a Marine Board of Investigation to have multiple hearing sessions or conduct additional witness depositions for complex cases.

According to Leake, the U.S. Coast Guard subpoenaed witnesses who were not government employees, including OceanGate co-founder Guillermo Sohnlein, former operations director, David Lochridge, and former scientific director, Steven Ross. Numerous guard officials, scientists, and government and industry officials are also expected to testify.

OceanGate will be represented by an attorney during the hearing, although the company currently has no full-time employees, according to a statement. The company has fully cooperated with the Coast Guard and National Transportation Safety Board investigations since they began, the statement added.

The implosion resulted in the deaths of Paul-Henri Nargeolet, a veteran Titanic explorer, Shahzada Dawood and his 19-year-old son Suleman Dawood from a prominent Pakistani family, and British adventurer Hamish Harding.

Rescuers rushed ships, planes, and other equipment to an area about 435 miles south of St. John’s, Newfoundland, after the Titan lost contact with its support vessel two hours after its final dive.

The discovery of the wreckage of the Titanic on the ocean floor about 330 yards off the bow of the Titanic, following the worldwide attention generated by the search for the submersible, confirmed that no one had survived the implosion.

The investigation into the Titanic's sinking was initially set to take a year, but it has taken longer. The Coast Guard announced in July that the hearing would examine all aspects of the Titanic's loss, including mechanical issues, regulatory compliance, and crew member qualifications.

Since 2021, the Titan has been making trips to the Titanic wreckage site.