Borr Drilling Rig Sinks off Gabon, One Dead, Four Missing
Borr Drilling’s Prospector 5 offshore drilling rig sank off Mayumba, Gabon, late Saturday, killing one worker and leaving four people missing from the 115 personnel on board. Gabonese authorities have mobilised naval search and rescue operations and ordered a technical investigation into the incident.
The five initially unaccounted-for personnel included one Indian national, who has since been found dead, and four others who remain missing. According to Sylvain Mayabi Binet, secretary general of the National Organization of Petroleum Employees, the missing personnel comprise three Gabonese nationals and one other expatriate.
Borr Drilling said preliminary information indicated that the rig suffered a punch-through event during preload activities, resulting in a loss of stability and the subsequent sinking. The precise circumstances remain subject to a technical investigation.
The incident occurred at approximately 9:40 p.m. on Saturday (2040 GMT) in the Dussafu Marin permit area, near the Mabomont production facility, according to Gabon’s Ministry of Petroleum and Gas.
Offshore Drilling Operations Halted
The Prospector 5, owned and operated by Borr Drilling, was contracted to support BW Energy’s offshore drilling operations in Gabon. The rig had not yet begun drilling when it sank.
The incident occurred within the Dussafu Marin permit, where BW Energy holds a 73.5% working interest and Panoro Energy holds 17.5%.
A punch-through event during preload operations can compromise a jack-up rig’s stability as it is prepared for offshore work. The investigation will need to establish the sequence of events and determine the technical factors behind the loss of stability. No final cause has yet been announced.
Gabon Launches Search and Rescue Response
Gabon’s Ministry of Petroleum and Gas activated a crisis unit and ordered the navy to reinforce maritime search and rescue efforts. Petroleum and Gas Minister Clotaire Kondja also ordered a technical investigation into the accident.
The crisis unit brings together the ministry, the navy, state-owned Gabon Oil, BW Energy and Borr Drilling, Kondja said.
Borr Drilling Chief Executive Bruno Morand expressed concern for those still missing and others affected by the incident.
“We are deeply concerned for those who remain unaccounted for and everyone affected by this incident,” Morand said.
He added that the company’s immediate priority was to support the ongoing search and rescue operation and safeguard the welfare of personnel involved.
Production Halted as Environmental Monitoring Continues
Panoro Energy said production had been halted following the accident, while reporting no damage or accidental discharges.
The Ministry of Petroleum and Gas likewise confirmed that no discharge of harmful substances had been observed. Pollution-response resources remained deployed to protect the coastline and nearby Mayumba National Park.
Although no harmful discharge had been reported, continued environmental monitoring remains important given the proximity of offshore operations to coastal waters and a protected national park.
Offshore Safety Under Scrutiny
The sinking of Prospector 5 places the focus on offshore drilling safety, rig stability and emergency preparedness during operations conducted before drilling begins.
The technical investigation will be central to determining why the rig lost stability during preload activities and whether the findings identify lessons for offshore drilling operations. The incident also underscores the importance of coordinated emergency response and environmental monitoring following accidents at sea.
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For now, the immediate priorities remain the search for the four missing personnel, support for those affected and a full assessment of the circumstances that led to the sinking. The final findings of the investigation have not yet been reported.
