Greenpeace activists boarded two Royal Dutch Shell oil platforms in the British North Sea on Monday in protest against plans to leave parts of the giant structures in place after production shuts down.
Pictures provided by Greenpeace show two people in yellow hats scaling one of two giant, rusty structures and unfurling a banner reading "Clean up your mess, Shell!"
Shell confirmed that protesters boarded the Brent Alpha platform and the Brent Bravo concrete legs.