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by loxs 2896 days ago
Most probably it's not "sewage" water but "corpse decomposition water"
2 comments

corpse decomposition water won't last 2000+ years especially if not frozen. Probably the coffin was porous or had crack from where the sewage water seeped into the coffin from a nearby leaking sewage pipeline.
If that's the case - then it's quite precious. Analysis of this water would reveal a lot.