That was a really good addition to the show, as the latter stops before the 2000s.I found it really incredible that they couldn't move it on wheels cause bearings couldn't be made to handle the weight load.
But it could be dragged along on Teflon skid plates. wow.
My favourite bits were the ‘cat flaps’ to get round the odd shape of the original containment structure.
There are a couple of cheesy EBRD you tube videos which go in more detail into the design and development of the new tomb. It took them over five years of design work, before they started building anything, as this is such a unique project.