#water

A stationary vertical sink at a chunk-corner seam defeats eject, mantle, and even hard-recover (the anchor itself can be buried under an overhang). The terminal escape is a top-out to the chunk surface.

Lowering the sea level in a priority-flood water pass doesn't drain interior lakes: they're perched at their own spill surface. Use a per-basin depth gate and a land floor for below-sea valleys instead.