Lab construction is proceeding rapidly and smoothly. The inner core of the reactor has been completed. The graphite rods will be loaded as a next step. And then the space will be filled with cooling water.
Or, more likely, this is the basement the dilution fridge trench. It is much more sophisticated than what I have sketched. You can see a deeper pit and sinks. This structure will be covered by concrete and the trench that I requested for the fridges will sit above. I think this is a flood security system.
Many thanks to Wilson Architects for keeping me updated.