Just drawn that in sketchup.

I was attempting to close the gaps in the space escalator cubes, so to be able to use the crucible later on, by protruding metal lining between the cubes, and having them welded either from the inside out, following tracks, or from the outside.

But that was not a good idea. It's a waste of materials and also takes far longer.

My original idea of segmenting a circular diameter like this (in the photo)

and dropping them down one by one, following interlocked pattern (I only drew 1 interlock to save time) just to place them in,

and then, dropping a welding machine inside each hole, which will contain the metal rods from XYZ axis, just as would space escalator, and weld the segmented pillars together underwater.

The interlocking pattern need not go all the way through after the first layer. Just small indentation enough for the next layer to be placed correctly in alignment to the bottom layer, and then drop in the welding machine to the holes to weld the metal from within.

Ideally, 1 welding machine will be able to weld the entire layer, if the powerline is able
to follow the tracks without creating a knot. or 1 machine dedicated to 1 line of holes.

Of course, the outer most layer will have tracks for the walls to be dropped in.

So as long as between the layers, there are no water coming through it, which can also be countered by creating a line of protruding metal at the very outer layer of the rim, to be welded by a machine externally from the surface following an outer track, after the inner layers are binded together. Then we have a funtioning pillar underwater.

The diameter will need to be calculated by the height it needs to go above the water...