A swarm of jellyfish is threatening a power plant in Israel.

The facility in Hadera uses sea water for cooling off purposes but huge numbers of jellyfish have been sucked into the cooling system.

Israel's Electric Corp, which runs the plant, has warned that entire cities could be left without power if the problem persists.

Nachum Plaumbaum, a worker at the plant, explained how the jellyfish could stop the power plant from functioning.