The concrete pipe let out in a creepy old abandoned natatorium. There was something in the water - something with slick, blubbery flesh, and tentacles. I went to get weapons. When I came back, there were more of them... and they had people trapped in the dark. (Don't think 'prisoners.' Think 'pantry.')
The things didn't like the light, and they fled when I cut them; but there were more of them than I'd expected, and those tentacles had a lot of reach.
If I'd stayed asleep, I might have found out whether I cleaned out the nest, or whether they got me, too. Stupid bloody alarm clock.