TEPCO has found that fuel rods in No. 1 reactor at Fukushima have melted together and are at bottom of reactor vessel.
Low water level in the vessel may indicate cracks in the vessel, and therefore leakage of radioactive water.
Japan Times, May 12, 2011.

This means that the cleanup time will be as much as 30 years, the maximum estimate by Hitachi.
Leakage from the vessel explains the high and contradictory readings obtained around Fukushima Daiichi plant and in seawater.

Bad news for those who formerly lived near the reactor complex.