What you are describing sounds like caissons construction. Support pillars that go into water to support things like bridges or even offshore wind turbines. But that isn't what your dream is about.

Analysis: You are subconciously aware on some level that something has violated what you consider sacred. You feel violated, angry and anxious over where this may lead. Whoever or whatever has transgressed you with the profane is even more outrage inducing because whatever was gained by the offender(s), is far outweighed by what they too lost. It's senseless, reckless wanton destruction of what you hold most dear.

You are trying to process a response, but haven't done so yet. Fight, flight, enlist allies? You don't yet know what's possible, let alone optimal.