Prospector 5 Rig Sinks Off Gabon: Five Missing as Search Continues and BW Energy Halts MaBoMo Output

A massive offshore drilling rig has sunk off Gabon’s southern coast, leaving five people unaccounted for after a search-and-rescue operation that has now stretched across several days. The Prospector 5, a jack-up rig owned and operated by Borr Drilling, went down on Saturday, October 24, while preparing for a drilling campaign for BW Energy in Gabonese waters. Of the 115 people on board at the time, 110 have been safely accounted for and brought ashore, the company said in an update on October 26. The five who remain missing are the focus of an extensive air and sea search, and of an investigation into how a rig built to stand on the seabed lost stability and sank.

What Happened to Prospector 5

According to Borr Drilling and BW Energy, the incident happened at about 20:37 local time on October 24, during preparations for drilling on the Dussafu Marine licence. The rig was carrying out jacking operations, raising and lowering itself on its legs in preparation for a planned campaign, when it lost stability during preload activities. Preload is the stage in which a jack-up rig tests how its legs bear on the seabed before drilling begins. Borr said preliminary information indicated a “punch-through”, an event in which one or more legs suddenly sink much deeper into the seabed than intended, causing the rig to tilt and lose stability. The company stressed that this is a preliminary finding, not a final cause, and that a full investigation is under way.

The rig, built in 2014, was supporting BW Energy’s drilling work at the Dussafu licence, off the southern Gabonese coast near Mayumba in the Gulf of Guinea. The campaign was due to drill new production wells for BW Energy’s MaBoMo facility, and BW Energy had expected first oil from the campaign in the first quarter of 2027. No revised drilling timetable has been announced, and the companies have given no quantified production impact so far. That pause matters beyond a single rig, because the campaign was booked for nearly a year and was central to BW Energy’s near-term growth plans in Gabon.

The Search for the Five Missing

Search and rescue operations are ongoing for the five individuals who remain unaccounted for. Gabon’s government said on Sunday evening that the five were three Gabonese nationals, one Indian national and one Croatian national. Three helicopters took part in the search on Sunday, alongside naval support and underwater equipment used to search the waters where the rig sank, according to Gabonese authorities. Borr Drilling said its onshore emergency response team is working with local authorities and BW Energy, and that the company is in contact with the families of the missing personnel. The 110 people accounted for are being brought ashore in Gabon, where care and support are being provided, the company said.

Search and rescue operations are ongoing for the five individuals who remain unaccounted for.

One point of reporting needs to be stated carefully, because accounts differ. Reuters reported on Sunday, citing sources familiar with the incident, that one person had died and four were missing. Borr Drilling did not confirm a death in its later update on Monday, and Gabon’s government also continued to list five people as missing, with searches ongoing. This article therefore reports five people as unaccounted for, following the company and the government, and notes the Reuters sourcing separately rather than treating a death as confirmed. As with any incident of this kind, the confirmed picture can change as the search continues and as official updates are issued.

• The Prospector 5 sank at about 20:37 local time on October 24, during preload and jacking operations.
• There were 115 people on board; 110 have been safely accounted for and five remain unaccounted for.
• The five missing were identified by Gabon’s government as three Gabonese, one Indian and one Croatian national.
• The rig was preparing to drill for BW Energy on the Dussafu Marine licence, near the MaBoMo facility.
• Gabon’s oil ministry has ordered a technical investigation into the sinking.
• No harmful discharge to the sea had been observed at the stage of the government’s Sunday update.

MaBoMo Shutdown and Market Reaction

BW Energy said production at MaBoMo had been shut down in line with standard procedures during drilling preparations. The company reported no damage to the facility or related equipment, and no accidental discharge of harmful substances into the sea from the facility itself. That distinction matters: the shutdown is described as a precaution linked to the drilling preparations, not as damage to the producing facility. Even so, the loss of the rig removes the drilling unit for the planned campaign, and investors reacted quickly. Shares in Borr Drilling fell on Monday in Oslo trading, down 7 percent at 0830 GMT after falling as much as 11.4 percent to an over two-month low, according to Reuters. Shares in BW Energy fell 7 percent and shares in Panoro Energy, a partner in the Dussafu licence, fell 10 percent in early Oslo trading.

The market reaction reflects how tightly the three companies are linked in this licence. BW Energy holds a 73.5 percent interest in Dussafu, Panoro Energy holds 17.5 percent, and Gabon Oil Company holds the remaining 9 percent, according to BW Energy’s licence description. A delay to the MaBoMo Phase 2 campaign therefore touches more than one balance sheet, and it arrives at a time when oil markets are already sensitive to supply disruption, including attacks on Saudi energy infrastructure in recent days. The Gabon incident is a different kind of disruption, an accident rather than an attack, but traders watch any removal of expected supply or drilling capacity in the same way.

Environmental Watch and the Investigation

Gabon’s oil minister, Clotaire Kondja, said the platform listed and subsequently sank during pre-loading operations ahead of a planned drilling campaign, and that no release of harmful substances had been observed at that stage. He said an inquiry had been opened to establish what happened and who was responsible, that the area is under continuous surveillance, and that pollution-response resources remain deployed to protect the coastline and Mayumba National Park. The government also noted that the rig carried 280 cubic metres of diesel, which is why environmental monitoring will continue even though no oil pollution had been observed in its Sunday update. BW Energy’s statement that there was no harmful discharge from the MaBoMo facility does not, on its own, settle the wider environmental picture for the sunken rig, and that is why the government surveillance and the technical investigation both matter.

The investigation will have to answer a narrow but difficult question: why did the seabed give way, or the rig lose stability, at that moment in the preload sequence? Jack-up rigs are designed for exactly this kind of operation, and punch-through events, while known in the industry, are serious precisely because they can develop quickly. Gabon’s oil ministry has ordered a technical investigation, and Borr has promised what it called a thorough investigation into the circumstances. Until those findings are published, any wider claim about fault or about a systemic problem would go beyond what the companies and the government have said.

What to Watch Next

What to watch next is whether the search finds the five people who remain unaccounted for, what the technical investigation concludes about the punch-through and the loss of stability, and whether BW Energy announces a revised timetable for the MaBoMo campaign or a replacement rig. The other tests are whether environmental monitoring continues to show no harmful discharge, whether the coastline and Mayumba National Park remain protected, and how the share-price falls for Borr, BW Energy and Panoro settle once the investigation and the search produce clearer updates. Until those questions are answered, the incident stands as a rescue operation first, an investigation second, and a paused drilling campaign third.