Under the cover of darkness, an enormous offshore oil rig begins to tilt. Its illuminated decks hang at an alarming angle as workers scramble toward lifeboats. Nearby, enclosed rescue craft float in the black Atlantic while the hulking structure sinks.

The terrifying scene, captured in footage circulating online , unfolded off the coast of Gabon, Central Africa, on Saturday, October 24. Tragically, not everyone made it home.

See the footage below:

The vessel was Borr Drilling’s Prospector 5 , a massive jack-up rig with 115 people aboard. Reuters reported that one worker, an Indian national, died, while four others—three Gabonese nationals and another expatriate—remained missing. The company’s October 26 update still classified all five as unaccounted for.

The rig was preparing for a drilling campaign in the Dussafu Marin field near Mayumba when disaster struck around 8:37 p.m., according to operator Borr Drilling.

Its scale makes the images especially staggering.…