Four reactors at France’s Gravelines nuclear power plant, located along the English Channel, were temporarily shut down over the weekend after a swarm of jellyfish threatened to clog critical water intake systems.

A jellyfish swarm forced the shutdown of reactors at France`s Gravelines nuclear plant. One reactor has restarted, with others to follow.

A nuclear power plant in northern France hit by a jellyfish invasion was getting back online on Wednesday, operator EDF said, with service restored at the first of four closed reactors. The Gravelines facility near Dunkirk on the French coast is the largest nuclear power plant in western Europe,