Tunnel

I’ve been walking for hours, but I haven’t found the end of this tunnel.
The walls get narrow, then they get wide.
There’s some phosphorescent rocks and moss down here.
I can make my way around without being totally blind.
The floor’s slippery. I have to walk slowly or I’ll fall.
This map doesn’t say how far I need to go. It’s torn, and part of it is missing.
The part I’m in.
I have no idea where I am going, I should keep going until I find a way out.
Or, I could stay down here.
Maybe next time.