Underground mining cart toilets - photo

[Frank S]

When nature calls; beats a minimum hour round trip to accomplish same.
You know, before she starts hollering....

I'll bet the handwheel connects to a gate valve, top might have some kind of seal, and composting occurs elsewhere. Pretty sure methane isn't a welcome addition to mine atmosphere.
Being a two holer, you could comment to your adjacent workmate; Nice seats! Aren't you glad they invented flathead screws?

Yep sometimes when you got to go you really got to go.
Once when I was about 16 taking my morning constitutional in our 2 holer outhouse a visiting Aunt burst in and flopped down on the adjacent hole Saying sorry but I just couldn't wait.
My cousins later made jokes about what could I have been doing in there with their mom