You bend forward and turn the handle of the hatch. It pulls outwards, revealing what looks like a garbage chute. The smooth metal disappears into darkness after a few inches.

You pull out your flashlight and shine it inside but it reveals nothing - the beam seems unable to penetrate the opaque black inside.

It is large enough to climb inside.

You can slide down the chute, or you can go back and...

Check the first hatch
Check the hole in the wall
Check the rope ladder by the wall
Check the trapdoor in the floor