For the first time in a while the tunnel doesn't branch, just continues on and on. Every time they run past a light bulb Reid has a moment of fear. All it would take for the hunters to win would be for them to shut off the power. Then either the black creatures Reid is sure are connected to the experiment or the hunters themselves would be able to sweep in and clean them up.

But the lights continue to burn and they keep running.

The tunnel has a constant mild curve ...