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Alright Mr Musk.
I've drawn what I was thinking about.
It follows the same principle with the crucible drop in the space escalator.
First create a pillar, and create a wall surrounding it, following the interlocking pattern.
Then create a courtyard, drain out the water. Then start mining.
You will see what I mean when you look at the drawings with the description.
Labeling, in order from 01 to 05.