So I went out again today.
Here's a picture of the drain I went in last time from the outside
(It gets round a quarter mile in)
Next I came up on this little area
That small hill on the left was so slippery it took me around 30 minutes to get up it. I kept sliding down, soaking myself in river water (YUM!)
Unfortunately about 100 feet in the tunnels go down to about 3 feet
I got really excited when I came up to this. I thought "Yes! A second, chill entrance!
Only to find out that's a police station in the background. I quickly ran!
Here's the only other drain I found. About three feet tall.
Nothing special yet. I'm gonna keep at it though!