Looking at older images of reactor #4, there should be a hole in the wall were the altered area of the photo is. In older images, there is what looks like a truck entrance, that extended out from the reactor building, and this has since been removed. Perhaps Tepco did not want people to see a gaping hole in the side of building.... you can see the truck bay that is no longer there in this photo.. http://cryptome.org/eyeball/daiichi-npp/pict12.jpg