Greenpeace deploys underwater boulders to deter trawling in North Sea

• Greenpeace activists dropped boulders in the North Sea to create an underwater barrier.
• The initiative aims to deter industrial trawling in a marine protected area.
• The action is intended to conserve porpoise populations in the Southern North Sea.
• The boulders were deployed with support from celebrities including Simon Pegg.
• The boulders were dropped from the Greenpeace ship Arctic Sunrise.