Climate activists with Greenpeace scaled a massive Shell vessel in the Atlantic Ocean as it headed to the British North Sea, displaying a banner that read “Stop Drilling. Start Paying.” Activists used ropes to climb onto the 51,000-tonne platform, and the four that made it aboard say they have enough supplies to occupy the ship for days.

Yeb Saño, executive director of Greenpeace Southeast Asia and former chief climate negotiator for the Philippines, was among the group of activists but was not able to make it on board. Greenpeace’s Victorine Che Thoener, a Cameroonian German activist who did successfully mount the ship, says the group took the drastic action to compel fossil fuel companies to stop drilling and pay for the loss and damage they have caused.