Custom OceanGate Titan: What Happened?
OceanGate Titan: What Happened, Why the Submersible Failed—and What the Investigation Found
On 18 June 2023, the submersible Titan began a dive towards the wreck of the Titanic in the North Atlantic.
It never returned.
During the descent, Titan’s pressure hull failed and the vessel imploded, killing all five people aboard. The accident occurred hundreds of miles southeast of Newfoundland and Labrador, at a depth where immense water pressure leaves almost no margin for structural weakness. (National Transportation Safety Board)
For several days, the world watched an enormous international search unfold.
But the loss of Titan ultimately became about much more than a missing submersible.
It became a story about engineering, risk, regulation, warnings, organisational culture and the consequences of operating an experimental vehicle in one of the most unforgiving environments on Earth.
What was the Titan submersible?
Titan was an experimental deep-sea submersible built and operated by OceanGate Expeditions.
It was designed to carry people to extreme ocean depths, including the wreck of RMS Titanic, which lies approximately 3,800 metres beneath the surface of the North Atlantic.
Unlike many conventional deep-diving vehicles, Titan used a pressure hull incorporating a large carbon-fibre composite cylindrical section joined to titanium end components.
OceanGate promoted the vehicle as an innovative approach to deep-ocean exploration.
But its unconventional design and development process also attracted concern.
Deep-sea pressure vessels experience enormous compressive forces. Every descent and ascent exposes the structure to another cycle of loading and unloading.
At those depths, structural integrity is not simply important.
It is everything.
What happened on 18 June 2023?
On the morning of 18 June, Titan began another descent towards the Titanic wreck.
At approximately 10:47 local time, while still descending, its pressure hull failed.
The vessel imploded.
All five people aboard died.
The NTSB later determined that the failure resulted from damage within the pressure vessel that had developed over previous dives and progressively weakened the hull. (National Transportation Safety Board)
The implosion was catastrophic and effectively instantaneous.
No rescue from that structural failure was possible.
Who was aboard Titan?
Five people were inside the submersible:
Stockton Rush, founder and chief executive of OceanGate.
Hamish Harding, British businessman and explorer.
Paul-Henri Nargeolet, French maritime expert and veteran Titanic researcher.
Shahzada Dawood, a Pakistani-British businessman.
And his son, Suleman Dawood.
Their deaths transformed what had initially been treated as a dramatic search-and-rescue operation into one of the most closely examined marine casualties of recent years.
Why did Titan implode?
The official investigations provide a much clearer answer than was available immediately after the accident.
The NTSB concluded that OceanGate’s engineering process was inadequate and that the carbon-fibre composite pressure vessel contained multiple anomalies and did not meet the necessary strength and durability requirements. (National Transportation Safety Board)
Investigators found that the pressure vessel likely sustained damage after an earlier dive.
That damage included delamination — separation within layers of the composite structure.
Further damage subsequently weakened the hull.
Eventually, during the fatal descent, a local structural failure occurred and the pressure vessel collapsed. (National Transportation Safety Board)
In simple terms, the hull had become damaged and weakened over repeated operations, but Titan continued to dive.
The problem with carbon fibre
Carbon-fibre composites can be extremely strong and lightweight.
But their behaviour under repeated deep-ocean compression is complex.
Traditional deep-diving pressure vessels are commonly made from metals such as steel or titanium, whose behaviour under repeated loading is comparatively well understood.
OceanGate instead pursued a large cylindrical carbon-fibre pressure hull.
That choice was central to the Titan concept.
It was also central to the eventual failure.
The NTSB found that OceanGate had not adequately established the actual strength and durability of the pressure vessel before operating it repeatedly at extreme depths. (National Transportation Safety Board)
The problem was therefore not simply that carbon fibre was used.
The deeper issue was whether the design had been sufficiently tested, validated and monitored for the environment in which it was being operated.
Testing and certification
One of the most important questions surrounding Titan concerned independent classification and certification.
In conventional marine engineering, classification societies provide independent technical scrutiny of vessel designs, materials, construction and operational standards.
OceanGate chose not to pursue conventional classification of Titan.
The company argued that existing certification processes could inhibit innovation and did not adequately accommodate novel technology.
Innovation itself is not inherently unsafe.
But when a vehicle carries people into an environment where a structural failure offers essentially no chance of survival, independent verification becomes particularly important.
The Coast Guard later identified inadequate design, certification, maintenance and inspection processes as primary contributing factors in the disaster. (US Coast Guard News)
The warnings
Concerns about Titan did not first appear after the implosion.
Engineers and other specialists had raised questions about aspects of the design and testing programme before the fatal expedition.
One of the most widely discussed figures was former OceanGate employee David Lochridge, who had expressed safety concerns during his time with the company.
Members of the wider submersible community had also questioned OceanGate’s decision not to follow established classification procedures.
Those warnings became particularly important after the casualty.
They raised a fundamental question:
Were legitimate technical concerns treated as obstacles to innovation rather than information that should have triggered further investigation?
The Coast Guard’s eventual findings placed significant emphasis on OceanGate’s organisational culture and decision-making, describing a workplace environment that contributed to the failure to address safety concerns properly. (US Coast Guard News)
The real-time monitoring system
OceanGate believed that Titan could monitor the condition of its own hull during dives.
The vessel incorporated a real-time monitoring system intended to detect acoustic and strain changes in the pressure vessel.
The concept was that developing problems could potentially be identified before catastrophic failure.
But the official investigations found something deeply important.
The monitoring system had generated data during earlier operations that should have been examined and acted upon.
The Coast Guard found that OceanGate failed to properly investigate known hull anomalies following the 2022 Titanic expedition. (US Coast Guard News)
The NTSB similarly concluded that OceanGate’s analysis of the monitoring data was flawed and that the company therefore failed to recognise that the pressure vessel had been damaged and should have been removed from service. (National Transportation Safety Board)
In other words, the vessel had a system intended to warn of structural problems.
The difficulty was not simply gathering the data.
It was understanding and acting upon what the data was saying.
The search for Titan
When communication with Titan was lost, an enormous international search operation began.
Aircraft, surface vessels and deep-sea equipment converged on the North Atlantic.
For several days, public attention centred on the possibility that the occupants might still be alive inside the submersible.
The limited oxygen supply became a focus of worldwide reporting.
Eventually, remotely operated vehicles located debris from Titan on the seabed near the Titanic wreck.
The evidence showed that the submersible had suffered a catastrophic implosion.
The NTSB later concluded that although OceanGate had not properly notified search-and-rescue authorities about its planned expedition and very few assets could operate at such depths, the Coast Guard’s search coordination was effective. (National Transportation Safety Board)
The search could not have saved those aboard after the pressure hull failed.
But the operation demonstrated how difficult responding to an emergency at extreme ocean depth can be.
Could the disaster have been prevented?
According to the U.S. Coast Guard Marine Board of Investigation:
Yes.
Its chairman described the loss of Titan and the five people aboard as a preventable marine casualty. (US Coast Guard News)
The investigation identified several major contributing factors:
OceanGate’s inadequate design process.
Insufficient certification and independent oversight.
Inadequate maintenance and inspection.
Failure to investigate known hull anomalies.
Failure to respond appropriately to monitoring data.
Problems within the company’s safety culture.
And gaps in domestic and international regulation governing experimental and novel submersibles. (US Coast Guard News)
The disaster therefore cannot reasonably be reduced to a single defective component.
It resulted from a chain of engineering, organisational and regulatory failures.
Regulation and the limits of innovation
The loss of Titan also exposed gaps in the regulation of privately operated submersibles.
Ocean exploration has always involved experimentation.
Many important advances in engineering have occurred because individuals and organisations were willing to attempt something new.
But innovation and safety are not opposites.
The challenge is ensuring that experimental technology is subjected to sufficient independent scrutiny before human lives depend upon it.
The Coast Guard investigation recommended stronger oversight of submersible operations and novel vessel designs, along with improved international standards and clearer requirements for emergency planning. (US Coast Guard News)
The NTSB likewise concluded that existing voluntary guidance and regulations were not sufficiently tailored to modern pressure vessels carrying people at extreme depth. (National Transportation Safety Board)
The human cost
It is easy for the Titan story to become dominated by carbon fibre, acoustic monitoring, engineering calculations and arguments about regulation.
But five people died.
They boarded the vessel because they wanted to see one of the world’s most famous shipwrecks.
Whatever debates continue about responsibility, risk and decision-making, those five lives should remain at the centre of the story.
For their families, Titan was not an engineering case study.
It was a permanent loss.
What did the official investigations conclude?
By 2025, both major United States investigations had reached detailed conclusions.
The U.S. Coast Guard Marine Board of Investigation found that the casualty was preventable and identified OceanGate’s inadequate design, certification, maintenance and inspection processes among the primary contributing factors. (US Coast Guard News)
The National Transportation Safety Board concluded that the probable cause of the implosion was OceanGate’s inadequate engineering process, which failed to establish the actual strength and durability of the pressure vessel.
The NTSB found that existing hull damage was worsened by further damage before the final dive, eventually producing a local buckling failure and catastrophic implosion. (National Transportation Safety Board)
These findings move the Titan story beyond speculation.
The disaster can now be examined against a substantial body of official engineering and investigative evidence.
Why the Titan disaster still matters
The loss of Titan matters far beyond one experimental submersible.
It raises fundamental questions about how innovative technology should be tested.
How much independent scrutiny should be required before people are placed inside experimental vehicles?
What happens when commercial ambition begins to outrun engineering evidence?
How should organisations respond when employees or specialists raise uncomfortable safety concerns?
And perhaps most importantly:
What happens when warning signs are present, but the people responsible for interpreting them convince themselves that continued operation is acceptable?
Those questions are not unique to deep-sea exploration.
They appear repeatedly in the history of major accidents.
The technology changes.
Human behaviour often does not.
Frequently Asked Questions
What happened to the OceanGate Titan submersible?
Titan suffered a catastrophic pressure-hull failure and imploded while descending towards the wreck of the Titanic on 18 June 2023. All five people aboard were killed. (National Transportation Safety Board)
What caused Titan to implode?
The NTSB concluded that OceanGate’s inadequate engineering process resulted in a pressure vessel whose true strength and durability had not been adequately established. Damage accumulated within the hull and ultimately led to a local buckling failure and implosion. (National Transportation Safety Board)
Was Titan made from carbon fibre?
A substantial cylindrical section of Titan’s pressure vessel was made from carbon-fibre composite material and connected to titanium components.
Did OceanGate know there were problems with the hull?
Investigators found that monitoring data and anomalies from previous operations should have prompted further investigation. The Coast Guard concluded that OceanGate failed to properly address known hull anomalies after its 2022 Titanic expedition. (US Coast Guard News)
Was Titan independently certified?
Titan was not conventionally classed through the established marine classification process used for many passenger-carrying submersibles.
Could the Titan disaster have been prevented?
The U.S. Coast Guard Marine Board of Investigation concluded that the loss of Titan and its five occupants was preventable. (US Coast Guard News)
Were the people aboard trapped waiting for rescue?
The official investigation determined that the pressure hull failed during the descent on 18 June 2023. The implosion was catastrophic, meaning a subsequent rescue was not possible. (National Transportation Safety Board)
Read More
TITAN — The OceanGate Disaster
In his investigative nonfiction book, Bill Stewart examines the loss of the OceanGate Titan, the development of the experimental submersible, the engineering decisions behind its design, the warnings that preceded the disaster and the lessons that emerged from the investigation.
The book looks beyond the dramatic search operation to examine the deeper question at the centre of the tragedy:
How did an experimental vehicle carrying five people reach the point where catastrophic structural failure became possible?
Read the book →
About the Author
Bill Stewart is a Scottish author and former Marine Auditor and Lead Accident Investigator.
Drawing on more than four decades at sea and professional experience involving accident investigation, safety management and complex operational systems, his investigative nonfiction examines major disasters, aviation and maritime history, intelligence operations and significant historical events.
His approach is straightforward:
Tell the story honestly. Respect the facts. Never lose sight of the people.