The circumstances highlight a greater issue. Swarm of jellyfish overwhelms nuclear power plant, causes several reactors to shut down — here's what happened first appeared on The Cool Down.

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.

A massive jellyfish invasion clogged the cooling intake systems at France’s Gravelines Nuclear Power Station, forcing several reactors offline in a rare, non-nuclear shutdown.