Greenpeace UK has announced plans to deploy new underwater boulder barriers in British Marine Protected Areas (MPAs), reviving a controversial tactic it says helped secure protection for parts of the North Sea and English Channel.
The environmental group says it will take direct action after accusing successive UK governments of failing to use post-Brexit powers to fully protect marine habitats from industrial fishing. The move comes a decade after the Brexit referendum and five years after the Fisheries Act 2020 gave ministers greater powers to regulate fishing activity in UK waters.
Greenpeace previously placed boulders on the seabed at the Dogger Bank MPA in 2020, the Offshore Brighton MPA in 2021 and the South West Deeps MPA off Cornwall in 2022. The organisation says the barriers were designed to prevent bottom trawlers from operating in sensitive marine habitats.
Protection Zone — Greenpeace's vessel Esperanza deploys inert granite boulders in the Offshore Brighton Marine Protected Area in 2021. The underwater barrier was created to help prevent bottom trawling and protect vulnerable seabed habitats in the English Channel. Photo: Suzanne Plunkett
Bottom trawling was subsequently banned in Dogger Bank and Offshore Brighton as part of the Marine Management Organisation’s MPA byelaw programme. However, Greenpeace argues that many protected areas remain open to other forms of industrial fishing.
The group says its analysis found that 1.3 million tonnes of fish have been caught in offshore UK MPAs since 2020, with more than one million tonnes taken by pelagic trawlers.
Greenpeace UK co-executive director Will McCallum said governments had failed to use existing powers to protect marine ecosystems. “Post-Brexit powers to fully protect marine protected areas have been available to successive governments for the last five years but all have sat back and let destructive industrial fishing continue,” he said. “Our oceans cannot wait any longer. If this government won’t protect our seas, we will.”
The campaign is backed by several conservation organisations, including Oceana, Blue Marine Foundation, The Angling Trust and Rewilding Britain. Public figures supporting the initiative include Stephen Fry, Paloma Faith, Simon Pegg and environmental campaigner Mya-Rose Craig.
In a letter to Prime Minister Keir Starmer, the signatories called for stronger protection of marine habitats and greater action to support coastal communities and marine wildlife. Singer Paloma Faith said Marine Protected Areas should be “more than a promise on paper”, while actor Simon Pegg described government action on the issue as overdue.
Greenpeace has not yet announced the locations of the proposed new barriers but says it intends to create further protected ocean sanctuaries unless stronger measures are introduced to safeguard existing MPAs.

















































