^New underground pipes, drainage etc. I have mentioned before that there is a ton of underground utilities to be laid throughout the site. Many of them will be under streets and walkways of a diagon yet to appear.
Think how complicated the underground drainage network is alone! The dewatering pumps are draining into both the lagoon and the pond next to the apartments. Fact is, it is all happening underground.
That said, two images big boy size:
These are well point plans (dewatering)... so there is a ton more prep... weeks and months. Arrow points to what may be the side of a building yet to come. St. Pancras??? click view images to see them full sized.
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