A huge nuclear power station in France has temporarily shut down after a "massive and unpredictable" swarm of jellyfish swam into the cooling system.

Last weekend, a surprising and uncommon issue arose at one of the biggest nuclear power facilities in Europe. It was not a storm, a technical breakdown, or a security threat. Instead, it was an invasion of jellyfish that forced part of the facility to stop operations.

A massive swarm of the squishy ocean drifters has forced the shutdown of one of France’s largest nuclear power plants. The marine interlopers clogged the cooling water intake systems at the Gravelines facility in northern France late Sunday, triggering an automatic halt to three reactors.