Fukushima cooling system was probably crippled before the tsunami struck.

A investigation by the Independent: “Throughout the months of lies and misinformation, one story has stuck: it was the earthquake that knocked out the plant’s electric power, halting cooling to its six reactors. The tsunami then washed out the plant’s back-up generators 40 minutes later, shutting down all cooling and starting the chain of events that would cause the world’s first triple meltdown.” But plant workers are telling reporters that the cooling system had failed pre tsunami.