"That's the spirit, Mister Scott."

Quentin says as he works by feel alone. This is why you always packed your own bag, you never knew when you might need to find something in the dark. There is a few moments of rustling movement, then there is a spray of sparks, another spray, and then a light blossoms quickly as Quentin holds up the torch. The lantern was still far above where they escaped from.

As the light took hold they could see where they were standing finally. The tunnel they'd dropped out of was still spilling out water but it was dwindling to a trickle. It cascades into what appeared to be a man-made pool based on the shape, about a twenty by twenty square, filled with water. Neary by was a tunnel that appeared to lead back up.

"Hrmm, perhaps the slide was built to quickly descend from the top?" Quentin speculates. "That tunnel, I am going to guess, leads back up to that gate I couldn't get open." So they weren't trapped, at least, not entirely. They would still be stuck behind the gate but they could yell at the father and son pair when they came to investigate.