Post-disaster photos, as well as a screenshot from the Chernobyl Experience Demo showing how it would have looked like before the disaster (they got some details wrong, such as the ladder placement). In post-disaster photos, you can see lots of new walls and ladders that were installed. The pump hall is partially filled with concrete, to a height from 1.5 up to 5 meters. https://sredmash.wixsite.com/obektukritie/12-402-3