World of Cumae: The Orbis
Coastal Caves - Flooded
Deluge
After clearing the debris blocking the old cave entrance, the party discovered that the cave mouth had been 30' underwater all along. All parts of the cave at or below the level of the cleared space were rapidly flooded, and though the water is draining slowly through the lower pool drain where Ten Hooks used to be, it will take months just to lower it to that level, and this will still leave much of the cavern complex flooded until the Humanoids do something to further drain it.
The Ophitic cult that had been using the northern chamber for their temple has presumably drowned, though the structures remain mostly intact under the water. Their area was a further 20' or so in lower elevation, so the water in that section is well over the top of the low buildings.