The spent fuel pool at Fukushima Unit 4 is the top short-term threat to humanity [8], and is a national security issue for America [9].
As such, it is disturbing news that the ground beneath unit 4 is sinking.
Specifically, Unit 4 sunk 36 inches right after the earthquake, and has sunk another 30 inches [10] since then.
Moreover, Unit 4 is sinking unevenly [10], and the building may begin tilting.
An international coalition [11] of nuclear scientists and non-profit groups are calling on the U.N. to coordinate a multi-national effort to stabilize the fuel pools. And see this [12].
Given the precarious situation at Unit 4, it is urgent that the world community pool its scientific resources to come up with a fix.