This week, Greenpeace U.K. has dropped more boulders into the sea surrounding the U.K. The dramatic action is part of the NGO's goal to end fishing boats from trawling the sea bed in Marine Protected Areas.

The hope is to tighten restrictions on one of the most destructive forms of fishing in protected waters around the U.K.

What bottom trawling is, and why it's dangerous

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Bottom trawling is a method used in fishing that involves dragging a huge, weighted net across the sea bed to catch fish and other sea creatures. It catches them in large quantities in one go, along with many other non-targeted species, such as turtles, and deep-sea corals.

This places a huge impact on the ocean's biodiversity, along with many species being fished on the brink of extinction — not by necessity, but by consequence.