Have you ever been inside a sewer?

And if you have, just what the hell were you doing down there, you little bugger?
But no seriously, I’m wondering. I was looking up pictures of the inside of sewers online. for some reason It seems it would be so cool to go exploring in them, if there weren’t turds and all sorts of nasty stuff running through em. Now of course there’s people who work down there, to make repairs and all, and well I don’t know much about sewer workers…I like to think they have special suits to protect them, and have access to whatever adequate protection and stuff they need so they don’t get all sick and infected. I mean it must be so gross down there. A lot of the pics show platforms and walkways, plus some even have lights, although I am guessing the lighted sections are major important parts where much of the work and regulations are done? Probably doesn’t have lights everywhere in there.

But do you have any sewer stories? Ever been in one? Know anyone who has? Sewers are dangerous in more ways than one obviously.
I’ve heard depressing stories about kids getting lost by entering sewer openings down by river banks and all. Most of the ones I ever saw as a kid had gratings over them so you couldn’t get inside. Hopefully nobody here has any depressing stories like that, but feel free to share, if there are, and if you want. Any sewer experiences at all to relate? Would you go check one out if it was safe? What about abandoned sewers that are no longer used? Is that even possible, or do they just close off certain sections? Also how come they make them round? Is it easier to build them this way, or does this have to do with smoother running water/waste? Or is that only older sewers that are built round?