JKtheJK, number 6 totally freaks me out. Looks like an endless fall. I like it.
Here's a few more from some tunnels visited more recently.
Careful in this tunnel guys, a couple friends and I went down here and some guys came in a little while after us saying they were cops. Long story short, they weren't, and they tried to rob one of my friends (me and our other friend were a little further down the tunnel). They left and then we heard them coming back as we were packing all our stuff up, so we booked it the other way. They didn't chase after us, but they were definitely following us so we didn't stick around.
Another heads up about this one, there is a certain part where the tunnel opens up and the cement drops off into nothing, but you can't really tell because the water stays flush. I knew it was there, but slipped when trying to climb out and fell in. It's GROSS. And very deep. So stay safe out there.
Careful in this tunnel too! Great tunnel, probably my favorite but because it's so wide cops are able to drive down here, and they've been chasing people out.