The approach to the Sunken Queen was easy enough for a high level adventuring party using wind walk. When they arrive, Andi and Ivan admire the naked woman on the side of the leaning pyramidal structure, while pretending to look for an entrance.
Ivan sends his new minion down to see if there is an entrance under the water, and finds one. The party then casts water breathing and makes their way down to enter the Sunken Queen. Upon entry, they meet their first guardian, an enormous Devilfish who fights quite well to the death. In an adjacent room they find a fascinating crystalline structure holding all sorts of treasure, but inaccessible to them at this time.
Heading up to the next floor, they find some dry spots, as well as the next group of guardians, a small contingent of Boggards and four strong Erinyes.