Borr Drilling’s Prospector 5 sank late on Saturday off the coast of Mayumba, Gabon, after a punch-through during jacking and preload operations turned a routine preparation phase into an offshore emergency. The jackup rig had not yet begun drilling.
Of the 115 personnel on board, 110 have been safely accounted for, but the company’s account and the first details that emerged did not line up. reported on October 25 that one employee had died and four others were missing, while an October 26 statement from Borr Drilling said five personnel remained unaccounted for and no fatalities were confirmed.
The timing mattered because the rig was being readied for a planned campaign supporting BW Energy’s operations, and the accident happened around 21:40 local time, during work meant to position the unit before drilling starts. Borr Drilling said it activated its onshore emergency response team and was coordinating with local authorities, the Gabonese navy and BW Energy on search and rescue efforts.
Gabon’s Ministry of Petroleum and Gas also activated a crisis unit involving the ministry, the navy, state oil company Gabon Oil, BW Energy and Borr Drilling, while Petroleum and Gas Minister Clotaire Kondja ordered intensified search and rescue at sea and a technical investigation. BW Energy confirmed the incident and said production at the MaBoMo offshore facility was shut down under standard procedures for drilling preparations, with no reports of damage to the facility or related equipment and no accidental discharge of harmful substances into the sea. Panoro Energy, which holds a 17.5% stake in the Dussafu licence, also noted the production halt and the lack of reported damage or discharges.
The key unanswered question is the one the companies have not yet resolved: what caused the punch-through event in seabed conditions to strip the rig of stability so quickly. Borr Drilling said extensive marine and air search and rescue operations remained ongoing, and that is where the story still sits, with the missing accounted for only in part and the investigation now aimed at explaining how a rig that had not started drilling could sink before it ever reached that stage.
