Rex does a quick look around. The doors are all blocked off. He could go through any one of those...but then he spots the tentacle. It probably wants him to go over there instead. Rex approaches the pit and looks down. No end in sight. He tosses down a bit of rubble near the pit, listening to where it may fall. He hears nothing.

"Huh. Guess it's the pipe or nothing, then."

At least it's not a train tunnel.

Rex carefully navigates the pipe's edges and the pit before crawling into the pipe itself.