T21.1

Searching the Ceiling
Perception DC 15 Bulging cutouts of rock hang from the ceiling.

DC 20 The flickering light makes them seem to almost sway with movement

DC 25 Looking closely you can see cable wrapped around three rocks, confirming that they're suspended.

Searching the Floor
Perception DC 15 The floor is uneven, with dips and cracks

DC 20 There is a faint glimmer of a trip wire running across your step.

DC 25 There are two more trip wires, hidden in the shadow of the first wire.

Disable DC 20 ''Simply severing the wire releases all the blocks. greatly blocking passage. Craftily you are able to undo the trap, preventing it from being triggered until rearmed.''

Acrobatics DC 10 (5 if running) to bypass the wires. But must spot them again at the other end)

Thwomps
Each thwomp fills a 10' square and deals 4d6 of bludgeoning damage. Attack +15 on the first and then Reflex DC 20 for the second two. as they fall in succession

From R21
''The floor is slightly slick with oil traipsed from the previous room. The passage is cool in temperature with high ceilings and about 10' wide. Shifty noises can be heard from down the hall.''

From R33
''The passage is cool in temperature with high ceilings and about 10' wide. The hall floor glistens with something slick the further you go.''