R6

''This chamber houses a natural spring. The air is damp. The water below you is relatively still.though water drips from stalactites above into the pool. The paths crumble slightly under your footsteps.''

Acrobatics DC 17 to not fall into the water from the paths. Take 1d6 falling damage if going to/from T6.1

Rats in the water!
Perception DC 18: There are rats swimming in the water below.

The rats, if caught up to the person who falls, halves their swim speed to get out of the pool

From T2.2
'' You enter a large chamber. The rocky path ahead drops off a couple feet down and is narrow, forking immediately. To your left it goes upward steeply and to your right remains relatively level. Both lead to further tunnels.''

From T6.1
 You enter a large chamber, the rocky floor ahead drops off many feet, is narrow and leads downward to a tunnel leading out, and another forking off from it to your left.

From T6.2
You enter a large chamber, the rocky floor ahead drops off a few feet, is narrow and leads to a tunnel exiting the chamber, and forks off to the right that goes steeply upward to another exit.