25 June 2012, Tokyo Electric Power Company (TEPCo) announcing today that they discovered, last month, that the outer walls of the building housing Reactor 4 are tilting!

TEPCo officials claim the building is still structurally safe! The third floor has the most extreme tilt, at 4.6 centimeters (1.8 inches).

Reactor 4, of all the reactors at Fukushima Daiichi, has the largest number of spent fuel rods located in a giant pool at the top of the building, housing more than 1,500 fuel rods. TEPCo says there is no worry about the spent fuel pool  as it is supported by central pillars, and not the outer walls.  (how many times has TEPCo made such statements that became famous last words?)