Since its inception, nuclear energy has faced a host of opposition, from oil conglomerates to well-intentioned anti-nuclear-weapons activists to environmental groups. As it turns out, even ocean critters are getting in on the movement.

The ongoing war between the natural world and humanity has entered its squishiest battle yet. On Monday, France’s Gravelines nuclear power plant went from humming along nicely to locked up like a French waiter being asked for ketchup thanks to a “massive and unpredictable presence of jellyfish.”

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