“Helicopter” - an activist yells. Then gun-wielding agents in balaclavas abseil down, onto the Greenpeace ship, to tow it to Russia. This is the story of a campaign against oil drilling in the arctic that takes a dangerous turn. And the debate it sparks within the movement - should the organisers have better anticipated the risks of their campaign? Who is responsible for activists’ safety?Presenter: Justin Rowlatt
Producer: Alix Pickles
Series Producer: Ellie House
Editor: Matt Willis
Sound Design and Mix: James Beard
Production Coordinators: Maria Ogundele, Brenda Brown, Sabine Schereck 
Commissioning Editor: Dan Clarke Archive:
Prirazlomnaya Gazprom Oil Rig Protest in the Pechora Sea, Russian Investigative Committee, 18/9/2013
Other archive footage provided by Greenpeace

Ten Fights That Made the Green Movement: 7. Impenetrable

New in Understand: Ten Fights That Made The Green MovementThe modern green movement has been shaped not only by protest, but by conflict within the ranks. Shared ideas are forged through friction - battles over tactics, solutions, or who gets a voice. Justin Rowlatt goes to the heart of these battles - to learn about these dramatic moments from the people who were there. Friends, or sometimes enemies, hashing out big ideas that help define what it means to be green.Understand from BBC Radio 4 - unravelling the complexities of the biggest stories and subjects that really matter right now.