The Prospector 5 jack-up drilling rig sank off Mayumba in south-western Gabon on Saturday night, October 24, during preparations for an offshore drilling campaign. Borr Drilling and BW Energy said 115 people were aboard, 110 were safely accounted for and five were initially unaccounted for as search-and-rescue operations began.
Reuters later reported on Sunday that an Indian employee among the five had been found dead and that four people remained missing. Its report attributed that update to three sources familiar with the incident. The Gabonese government had not confirmed the death at that point and continued to describe five people as missing, so the difference is stated rather than silently resolved.
What the companies confirmed
Borr Drilling owns and operates Prospector 5, which was contracted to support BW Energy on the Dussafu Marine licence. The incident occurred at about 20:37 local time while the rig was conducting jacking and preload operations before drilling began. That timing matters because the rig had not started the planned well campaign.
The four people Reuters reported still missing included three Gabonese nationals and another expatriate. Public reporting had not established a final, officially reconciled casualty list or the circumstances of the reported death. Families should receive direct notification before names or private details circulate through unverified lists.
The casualty accounts are not yet reconciled
Borr Drilling said preliminary information pointed to a punch-through event during preload activities, followed by loss of stability and sinking. In a jack-up operation, the rig's legs and the seabed must support the platform as it is elevated. A preliminary company explanation is a starting point for investigation, not a final finding about engineering failure, operating decisions or legal responsibility.
Gabon’s petroleum ministry activated a crisis unit bringing together the ministry, navy, Gabon Oil, BW Energy and Borr Drilling. Reuters reported that the navy was ordered to reinforce the search and that the ministry opened a technical investigation. Those steps confirm an official response; they do not establish the cause or determine liability.
A preliminary punch-through explanation
BW Energy said production at the nearby MaBoMo facility was shut down under standard procedure during drilling preparations. It reported no damage to that facility or related equipment and no accidental discharge of harmful substances from the facility. The statement is limited to MaBoMo and should not be expanded into a final environmental all-clear for the sunken rig.
The petroleum ministry likewise said no harmful discharge had been observed and that pollution-response resources remained deployed to protect the coast and nearby Mayumba National Park. 'Not observed' is the status reported during the emergency, not proof that no later leak, debris field or underwater risk can emerge.
Production stopped and pollution teams remain ready
The immediate priority is finding the missing personnel while protecting rescue crews. Weather, sea state, the rig’s resting position and underwater hazards can shape what search teams can safely do. Public updates should separate people confirmed safe, people confirmed dead and people still missing, with a time attached to each count.
The technical investigation will need to examine seabed data, leg and footing performance, preload calculations, weather and sea conditions, inspection and maintenance records, operating procedures, alarms, evacuation timing and contractor responsibilities. The rig’s voyage and positioning records can help establish the sequence without relying only on recollection.
What the investigation must establish
Environmental follow-up should publish monitoring locations, sampling methods, any observed sheen or debris, and the agencies responsible for shoreline protection. The absence of reported harm to MaBoMo is useful but narrower than an assessment of the rig, fuel, drilling materials and the wider marine area.
The verified position late Sunday is therefore layered: the rig sank; 110 of 115 people were initially reported safe; Reuters reported one death and four missing; the government had not yet confirmed that death and still reported five missing; a company described a punch-through as preliminary; and an official investigation and search remained under way. The next update should reconcile those records rather than repeat the earliest count as final.
