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From Pathfinder #161: Belly of the Black Whale, which isn't enabled.

Ink Drowning Vats

COMPLEX HAZARD 18
Stealth +36 (master)
Description Steel hatch doors automatically lock shut in each of the four vats labeled J2. Four ink spouts (one per vat) jut through a narrow aperture in the ceiling of each vat, 20 feet above.

Disable DC 40 Thievery (master) to seal an ink spout, DC 48 Thievery (master) to unlock a steel hatch door, or DC 45 Athletics (master) to Force Open a steel hatch door

AC 39; Fort +30, Ref +27
Hardness 22, HP 112 (BT 56); Immunities critical hits, precision

Fill Tank
Trigger The switch outside the vats is pulled

Effect The trap rolls initiative.
Poison Ink (poison)
Saving Throw DC 38 Fortitude
Maximum Duration 10 rounds
Stage 1 3d6 poison damage and sickened 1 (1 round)
Stage 2 4d6 poison damage and sickened 2 (1 round)
Routine (4 actions) The trap loses 1 action for each disabled ink spout. On each of the trap's actions, a spout pours ink, increasing the depth of the ink in that vat by 2 feet. Creatures standing in the ink are exposed to a dose of poison ink. Once the vat is full of ink, the trap stops using actions, but creatures in the vat might start drowning.
Reset The trap can be reset by refilling the ink storage tanks above the vats.
Pathfinder #161: Belly of the Black WhaleOGL