pf2e.fyi
From Pathfinder Society Scenario #1-20: The Lost Legend, which isn't enabled.

Boggard Pit (5-6)

HAZARD 3
Stealth +12 (or 0 if the net is exposed)
Description A net with soil and aquatic plants on it covers a 10-foot pit dug into the bottom of a body of water.

Disable DC 18 Thievery to remove the net

AC 19; Fort +6, Ref +6
Hardness 5, HP 21 (BT 10); Immunities critical hits, precision

Pitfall
Trigger A creature walks on the net.

Effect The triggering creature falls into a spiked pit and submerges, with the net collapsing to entangle the creature. Spikes in the pit deal 2d10 piercing damage. The net imposes a –10-foot penalty to the creature's speed. A creature must succeed at two DC 18 checks to Escape from the net a critical success to Escape frees them immediately. A creature that can't breathe underwater may begin drowning. Any round the creature struggles to escape the net, the creature uses 2 rounds of air.
Reset Others can fall into the pit, but the net entangles only the first creature to trigger the trap. The net must be reset manually.
Pathfinder Society Scenario #1-20: The Lost LegendOGL