I was going to say a similar thing:

Almost looks like the foundations/pilings sunk on the one side, causing the concrete to fracture at the support points since it was being "bent" and then the slabs to fall off of the support once it had sunk enough. Kinda like this brick domino video [0], but with much larger slabs.

[0]: https://www.youtube.com/watch?v=-BTWiZ7CYoI

Yes, the bottom of the cross bracings are underwater on the near side and well above the surface on the far side.