In the final moments before the Titan submersible imploded, the crew sent a message saying "all good here."

The crew of the OceanGate Titan submersible experienced faulty communication with the surface crew before their submergence, with their final message being "all good here."

The U.S. Coast Guard offered details about the final moments of the OceanGate Titan submersible's implosion, which resulted in the deaths of five individuals, including U.K. billionaire Hamish Harding, OceanGate CEO Stockton Rush, father-son pair Shahzada Dawood and Suleman Dawood, and French mariner Paul-Henry Nargeolet, during a multi-day hearing on the investigation.

On Monday, the first day of a two-week hearing, the U.S. Coast Guard unveiled the animation regarding the causes of the implosion.

The Titan's crew communicated with the Polar Prince via text messages while the submersible was being towed to the Titanic's location.

On June 16, 2023, at approximately 9 a.m. local time from St. John's, Newfoundland, Canada, the Polar Prince set sail with the Titan on board. The two vessels arrived at the Titanic's location on June 18 in the morning.

The submersible descended to the Titanic at around 9:20 a.m. that morning, with both vessels exchanging text messages.

The Polar Prince inquired at 9:53 a.m. if the Titan crew could view the Polar Prince on its display within the submersible. Despite six messages and 15 minutes, the crew did not reply until sending a text message.

The Polar Prince told the crew of the Titan they needed better communications.

The Coast Guard believes that the person who identified himself as "PH" from the Titan was actually Nargeolet.

The Titan had reached a depth of approximately 2,275 meters with a pressure of 3,337 psi.

The Polar Prince was visible on the display, and Nargeolet confirmed that everything was fine when asked.

The Polar Prince and Titanic maintained contact, with the former inquiring about the latter's location and reminding it to record the location and time when deploying the "niskin bottle."

At 10:41 a.m., the Titan crew informed the Polar Prince crew that the bottle would not be deployed as it had not been cleaned.

At 10:47 a.m., the Titan informed the crew of the Polar Prince that it had lost two weights.

Moments later, the Titan imploded.

At a depth of 3,346 meters, the submersible lost communication and tracking with the Polar Prince at 10:48 a.m., according to the Coast Guard.

The undersea exploration debate was sparked by the morning's implosion.

In 2022 and 2023, the submersible was left exposed to the elements for seven months during storage, according to the Coast Guard's report. Additionally, the hull was not reviewed by third parties, which is standard procedure.

The scrutiny from the undersea exploration community was due to the unconventional design of the submersible.

On Monday, during the hearing, OceanGate's former engineering director, Tony Nissen, testified that he felt pressured to start operations while working for the company. When asked if there was pressure to get the Titan into the water, Nissen replied, "100%."

The engineering director was questioned by the marine board about whether the pressure affected safety decisions and testing. After a moment of contemplation, Nissen responded, "No. It's a challenging question to respond to because with an infinite amount of time and an unlimited budget, you could conduct an infinite number of tests."

In 2018, Nissen testified that the Titan was struck by lightning during a test mission, which may have compromised the hull. He was fired in 2019, the same year he refused to let the Titan go to the Titanic. Nissen told Rush that the Titan was "not working like we thought it would."

Nissen testified on Monday that he did not trust the operations staff and refused to pilot the submersible when asked by Rush, stating, "I’m not getting in it." The submersible underwent additional tests and adjustments before making subsequent dives to the Titanic.

Rush was challenging to work with, according to Nissen, who noted that he was frequently preoccupied with expenses and deadlines. Additionally, Nissen pointed out that Rush was known for fiercely advocating for his desires, which frequently shifted on a daily basis.

He stated that most individuals would eventually retreat to Stockton.

The Coast Guard's Marine Board of Investigation is the highest level of marine casualty investigation, and after its conclusion, recommendations will be submitted to the commandant. Additionally, the National Transportation Safety Board is also conducting an investigation.

""Although there are no words to ease the loss experienced by the families affected by this tragic event, we hope that this hearing will shed light on its cause and prevent a recurrence," said Jason Neubauer of the Coast Guard Office of Investigations, who led the proceedings."

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

A massive search and rescue operation was launched after the Titan lost contact with its support vessel two hours after its final descent, about 435 miles south of St. John’s, Newfoundland.

The discovery of the wreckage of the Titanic on the ocean floor about 330 yards (300 meters) 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 initially had a time frame of one 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 and compliance with regulations and crew member qualifications.

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

The Associated Press contributed to this report.