Gabon jack-up Prospector 5 sinks off Mayumba — five missing after punch-through

LAGOS / LIBREVILLE — A jack-up drilling rig working Gabon’s offshore oil belt sank on the evening of 24 October 2026, turning a routine preload into a multi-day search-and-rescue and a political visit to Port-Gentil.

Borr Drilling, which owns and operates the Prospector 5, said the incident occurred at about 20:37 local time during jacking operations in preparation for a planned campaign on the Dussafu Marine licence for customer BW Energy. Preliminary company language described a punch-through during preload that led to loss of stability and the rig’s sinking.

People first — numbers from the operators

Both Borr and BW Energy put 115 people on board at the time. 110 were safely accounted for; five remained unaccounted for as search operations continued. Gabon’s government statement named three Gabonese nationals among the missing, plus one Indian and one Croatian national, and said diplomatic channels had been opened for the foreign families.

BW Energy said production at its MaBoMo facility was shut under standard procedure during the drilling-preparation window, and that it had no reported damage to that facility or accidental discharge of harmful substances from it. Those are company statements; environmental sampling and the petroleum ministry inquiry will be the longer file.

State response

President Brice Clotaire Oligui Nguema cut short a private trip and visited Port-Gentil on 26 October to meet survivors and families, Gabonese and regional reporting said. Authorities said they had stood up a government crisis cell under the petroleum minister, a maritime command post, and local cells in Mayumba and Port-Gentil, and that Congo-Brazzaville’s navy joined the search after Oligui spoke with President Denis Sassou Nguesso.

For African energy desks, Prospector 5 is a reminder that Gulf of Guinea and Central African upstream risk is not only price and offtake — it is seabed geotechnics, jack-up preload discipline, and how fast states can coordinate SAR across a maritime border. AB24’s verified overnight facts stop at the company casualty counts, the punch-through framing, the Dussafu/BW Energy contract context, and the Port-Gentil presidential visit. Cause findings belong to the opened inquiry.

Mayumba sits near the maritime boundary with Congo-Brazzaville — which is why the bilateral SAR ask mattered within hours. For operators along the Dussafu trend, the commercial question after SAR is simpler and colder: how long MaBoMo stays offline under procedure, what the petroleum ministry inquiry finds about preload and seabed conditions, and whether jack-up campaigns elsewhere in the Gulf of Guinea change their geotechnical conservatism.

Sources: Borr Drilling release, 25 Oct 2026; BW Energy regulatory note, 25 Oct 2026; Gabonese government declaration on Prospector 5 (AGP), 25 Oct 2026; RFI / AGP coverage of the 26 Oct Port-Gentil visit. Cause of punch-through and final missing-person status subject to ongoing search and inquiry.

— AB24 · Lagos