>>2199832^that pic gives you a sense of the scale of some of these spaces, it can be literally like football fields of just concrete slab.
Walking in the pic on this post, I found a random trash letter with contents inside, and it was from a kid I grew up with in middle school who had moved away and lived far from the tunnel area, but I coincidentally came across a letter he wrote to a relative who apparently lived near that tunnel and got dumped into the trash/sewer system
