A major offshore drilling accident off the coast of Gabon has triggered an emergency search-and-rescue operation after the Prospector 5 drilling rig sank during preparations for a new drilling campaign.
The incident occurred on Saturday, October 24, 2026, in the Dussafu Marin licence area. The rig had 115 people on board when it lost stability and went down. Initial reports confirmed that 110 people had been safely accounted for, while five were missing. By Sunday, October 25, one of the missing workers had been found dead, leaving four people still unaccounted for, according to Reuters.
The accident has drawn attention to the risks associated with offshore drilling operations, particularly during the complex procedures used to position and stabilise jack-up rigs before drilling begins.
What caused the Prospector 5 rig to sink?
The rig’s owner and operator, Borr Drilling, said preliminary information suggested that a technical incident occurred during preload activities while the platform was being raised on its supporting legs.
The event, commonly described in the offshore industry as a punch-through, involves a rig’s legs unexpectedly penetrating the seabed or a weaker layer beneath it. This can undermine the platform’s stability and, in severe circumstances, cause the structure to tilt or collapse.
Borr Drilling said the loss of stability led to the rig sinking. However, the precise sequence of events and the underlying technical cause still require investigation.
The accident happened at approximately 8:37 p.m. local time on October 24, according to the company’s initial statement. Gabon’s authorities later placed the incident at around 9:40 p.m., illustrating a difference between the reported times in early accounts. Both accounts place the sinking on Saturday evening.
Search-and-rescue operation continues
The emergency response involves Borr Drilling, local authorities, offshore energy partners and rescue personnel working to locate the remaining missing workers and support those affected.
Gabon’s Ministry of Petroleum and Gas activated a crisis unit and ordered the navy to strengthen search-and-rescue operations. Authorities also announced a technical investigation into the accident.
Borr Drilling chief executive Bruno Morand expressed concern for the missing personnel and their families, saying the company’s immediate priority was supporting rescue efforts and ensuring the welfare of workers affected by the incident.
The company also provided a contact number for relatives seeking information or assistance: +44 (0)1224 087026, according to its initial statement reported by Offshore Energy.
The changing number of people unaccounted for has underscored the urgency of the operation. Families and colleagues are waiting for further information as authorities work to establish what happened and determine the fate of those still missing.
Rig was preparing for BW Energy’s drilling campaign
The Prospector 5 was due to support drilling activities for BW Energy in the Dussafu Marin offshore licence.
The 2014-built rig is a self-elevating jack-up unit designed to operate in water depths of up to 400 feet. Its legs can be lowered to the seabed, allowing the main platform to be raised above the water during operations.
At the time of the accident, the rig was preparing for a planned drilling campaign and had not yet begun the drilling work associated with the programme.
The Dussafu Marin area is an important offshore oil and gas development zone for Gabon. BW Energy and its partners rely on drilling infrastructure in the area to support production and development activities.
Oil production temporarily halted
Following the accident, production at the MaBoMo facility was shut down in line with operating procedures during the ongoing drilling preparations.
BW Energy said there had been no reported damage to the facility or associated equipment and no accidental release of harmful substances into the sea from the facility. Panoro Energy, which has an interest in the field, also reported that production had been halted and that no accidental discharge had been reported.
Although no pollution had been reported in the initial statements, authorities said environmental response resources remained deployed as a precaution to protect the coastline and nearby Mayumba National Park. The situation may change as inspections and investigations continue.
The production interruption adds an operational consequence to the accident, but the immediate priority remains the missing workers and the safety of personnel involved in the response.
Investigation expected to establish the cause
The sinking of the Prospector 5 raises questions about the conditions that led to the loss of stability during the preload procedure. Investigators will need to assess the seabed conditions, the rig’s positioning and the technical systems involved in the operation.
The incident also highlights the importance of safety procedures during the installation and positioning of offshore drilling platforms. Jack-up rigs must be carefully stabilised before drilling, and unexpected seabed behaviour can pose serious risks to both personnel and equipment.
Gabon’s government, the drilling contractor and the companies operating in the area are expected to work together as the investigation proceeds.
For now, the key priorities are locating the remaining missing workers, supporting survivors and their families, and establishing the facts behind the sinking. Further findings will be important in determining whether additional safety measures are needed for future offshore operations.
