As Drax moves down the tunnel, the noise becomes more distinct. It is a man talking, but the words seem to make little sense and the voice sounds as if someone had made a hole in the man's throat.
"Garbage, take out the garbage, and there is a skull sitting atop the dirt with the rats dancing around. Visitors never come to take out their garbage. We hear them. Crawling like rats to take out the garbage. There's a good girl..."