Following up this article..Possible uneven settlement of reactor 4
On 6/26/2012, Tepco published the latest pictures of Fukushima plants.
The series of photos included the picture of when they were improving soil on South-West side of reactor4 building.
↓ Cement silo for the soil improvement
It can be assumed that this is for the construction of the reactor cover to remove spent fuel, but it’s also suggesting the ground can not bear the weight of the cover building anymore.
↓ Other photos released