There are two control cylinders under the water here somewhere. One is found in each of the two different areas of the sewers. Drake stubs his toe on the cylinder when you walk onto a square with a cylinder.

Much of the stuff here can only be seen once the sewers have been drained.

Wahooka will give you a key to a hidden chest in exchange for the heads of three men long dead.

Once the sewers are drained, then you must kill the tentacle beast.

When standing beside an illusionary wall you will hear the wind whistling. For one of them, you will hear this only when NOT facing the wall.

The exit to the next level (back through the lower keep) is through a secret passage near the tentacle beast.

Spoilers

Press shift-F8 to display current location.

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Start @(24,17), (30,9)
Stairs up @(24,17), (30,9), (28,21)
* No stairs down. Route is up through a separate area of the lower keep, then down another path.

- Wahooka @(30,15). Wants 3 skulls in exchange for a red triangle key. Key unlocks a chest hidden behind an illusionary wall.
- Tentacle beast around (21,18). It'll show up. Hint: it won't attack you @(21,17). Move forward to lure it in, then move back when it shows up, and throw things at it. Don't kill it until after the water has been drained, or you may not be able to find the marble statue it carries.
- Manna Circle @(5,18)
- Illusionary walls @(24,20)-(25,20), (27,29)-(27,30)
- Jammed door @(16,18)-(16,19). Opens when the sewers are drained.

- Cylinders @(14,30), (3,16). Used upstairs to drain water down here.
- Marble Statue around (21,18) is carried by the tentacle beast. (Note: statue is of a serpentine dragon, otherwise known as a DRAKE! Nice joke.) Place on pedestal upstairs to open door to next level.
- Chest @(27,26). Need triangle key to open (from Wahooka).
- Rune scroll - shrink rune (in chest above).
- Basket for throwing darts @(18,3). Use by putting darts in, then holding in hand and attacking with it.
- Slightly battered helm @(8,14)
- Hammer @(1,6)