Greenpeace has dropped nine boulders, each weighing about two tonnes, onto the seabed of the Southern North Sea Marine Protected Area off the east coast of England.
The purpose is physical rather than symbolic. Bottom trawling drags heavy nets along the seabed, and a net that meets a two-tonne rock is a net that tears. The organisation says it has now cleared 116 square kilometres of the area from trawling.
The case they are making
Greenpeace's argument is about damage that is hard to see and therefore easy to permit. Dragging nets along the bottom disturbs the seabed, destroys the plants and structures growing there, and creates food shortages for many fish by removing what they feed on.
The organisation also points to noise. Trawling is loud, and it says the noise damages the hunting ability of porpoises — animals that locate prey by sound rather than sight.
On the decision to act without permission, Greenpeace's position is that years of meetings with politicians produced slow progress, and that this was a last resort rather than a first one.
The detail that separates this from vandalism
After dropping the boulders, Greenpeace told the authorities exactly where they were, so that charts could be updated and other vessels warned. The Marine Management Organisation has published the location details.
That matters more than it might appear. An unmarked two-tonne obstruction on a seabed is a hazard to any vessel, not only to trawlers. Reporting the positions converts the action from something that endangers people into something that obstructs one specific practice — which is presumably the whole point, and is also the difference between a protest and a crime against navigation.
It is not the first time. Greenpeace dropped 18 boulders off the Cornwall coast in 2022.
What the government said
A spokesperson for the UK department responsible for the marine environment said the country has strict laws protecting it, that all marine activities should follow the law, and that the safety of sea users must be considered.
They added that more than 100 locations already ban harmful fishing and that stricter restrictions are under consideration. No fishing organisation is quoted objecting in the report, and whether Greenpeace has broken any law is not stated.
The question underneath
The phrase doing the most work here is "marine protected area". Greenpeace's action only makes sense as a protest if trawling was happening inside one — which is to say, if the protection was a designation rather than a prohibition.
That gap between a line on a chart and a rule that is enforced at sea is the actual subject. A protected area where the damaging activity continues is a naming exercise. Nine rocks are a crude way to make the designation real, and the fact that they work at all is the uncomfortable part of the story.
What happens to the boulders now
They stay. That is the point of using rock rather than a buoy or a banner — a protest that ends when the ship leaves changes nothing, and a two-tonne stone on a seabed is not retrieved cheaply by anybody.
Which is also the strongest objection to the tactic, and it deserves stating. Greenpeace has made a permanent physical alteration to a seabed it does not own, on its own judgement of what the protection should have meant. If the precedent is accepted, the same reasoning is available to anyone with a boat and a different conviction about what a stretch of sea is for.
