Four reactors at France’s Gravelines nuclear power plant were shut down late Sunday due to a swarm of jellyfish in the cooling systems, operator EDF said on Monday, likely due to rising water temperatures because of global warming.

Four of the plant’s reactors shut down after swarms of jellyfish clogged its pumping stations. It isn’t the first time the creatures have thwarted nuclear plants.

The Gravelines nuclear power plant in Ford, France, had to temporarily shut down on Sunday, Aug. 10. A swarm of jellyfish impacted the power plant's reactors after t