A. "The Hole" a shaft that goes down from First Floor to Second Floor and keeps going down into the "Piranha Pit" where Stiletto Fang Piranha spawns
B. Shaft down from Second Floor
C. Shaft up from Second Floor to #4
D. "Bubble's Tube" a shaft down from Second Floor to opening to north and eventually to #3
E. Shaft up to #14
1. "First Floor" with Fierce Impaler who drops Gloomwater Harpoon (Common) and Darksea Harpoon (Rare)
2. "Second Floor"
3. "Bubble's Den" with Cauldronbubble who drops Sharkbone Warhammer (Common) and Hammerhead Helm (Rare)
4. Room with Golden Haired Mermaid who drops Lock of Hair
5. "Fallen Gate Room" with shaft to east which leads downwards
6. "Safe Den"
7. "The Balcony" which is a common pull spot for Estrella
8. "Estrella's Temple" with Estrella of Gloomwater who drops Rod of Drones (Common) and Lamentation Blade (Common) and Prayer Shawl (Rare) and Shellara Ebbhunter who drops Gloomwater Arrow (Common) and Pearlescent Mask (Rare)
9. "Temple of Prexus" with Undertow who drops Blazing Wand (Common) and Squallsurge Shawl (Rare)
10. Spawn spot of Coralyn Kelpmaiden who drops Sharkbone Warhammer (Common) and Sharkskin Drum (Rare)
11. "Seahorse Caves" with Seahorse Matriarch who drops Rod of Health (Common) and Shield of Prexus (Rare)
12. "The Crossroads" with a frenzied bull shark who drops Abalone Gorget (Rare)
13. "Boil's Lair" with Cauldronboil who drops Sharkjaw Cutlass (Common) and Kedgemail Gauntlets (Rare)
14. "Frenzied Room" with Frenzied Cauldron Shark who drops Shark Tooth (Common) and Abalone Gorget (Rare)
15. "Patriarch's Room" with Seahorse Patriarch who drops Wand of Ice (Common) and Seahorse Scale Cloak (Rare)
16. "Ferocious Room" with a ferocious hammerhead who drops Wand of Shadow (Common) and Driftwood Treasure Chest (Rare)
17. Room with Phinigel Autropos who drops Blue Crystal Staff (Wizard Epic), Kedge Backbone (Bard Epic), Robe of the Kedge (Rogue Epic), Rod of Malisement, Staff of Elemental Mastery: Water, Trident of the Seven Seas, Wand of Mana Tapping, Fusible Coral Ore
Not marked on map:
In the room south of the "Patriarch's Room" there is a spawn point for the 'frenzied shark' which drops the Abalone Gorget just like a frenzied bull shark. It's placeholder can be a sailfin or a cauldron hammerhead. (Note - this is not the room with a ferocious hammerhead spawn).
Note: in the above map the lettered areas are shafts of water that extend in and out of the page.