WaPo: Nuclear expert Arnie Gundersen just confirmed that some of the Japanese nuclear reactors were severely damaged even before the tsunami hit. Specifically, Gundersen reports that the containment vessel at Fukushima 1 started leaking and melting down before the tsunami hit. Similarly, Gundersen notes that the fuel pool at reactor 4 cracked and started leaking after the earthquake and before the water hit.” (includes video)