Nuclear power plants are some of the most secure facilities on Earth. To date, human hackers have caused no significant damage to them, although creatures without a brain have. In 2013, jellyfish began a mass assault that IT experts would probably call a denial-of-service (DoS) attack.

A huge swarm of cnidarians blocked the cooling water pipes of the Oskarshamn nuclear power plant on Sweden’s Baltic coast, a station that provides 10% of the country’s electricity supply. This caused one of the three reactor blocks to switch off for three days. Despite being 95% water jellyfish are a force to be reckoned with – power plants situated on the coasts of South Korea, Oman, Scotland and the US have already fallen victim to them.