I've been around coral castle forums for a while and I've never seen reference to this. Let's call it Flems pipe LOL. This approximate 2" pipe came out behind his tool room. This would be located on the southwestern side of the room (opposite the flywheel) but there were tools and parts stacked against the wall inside so we couldn't confirm it inside.
Looking up, it is located to the west of the upstairs window
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Heron(Hero) of Alexandria(50AD) constructed pipes and conduits underground. One would approach the temple doors and light a fire on the altar.. the force of the steam created by the fire would be strong enough to open the doors.
I am not sure if there are pipes near Eds BBQ? or at another possible heat source, perhaps there is a similar device at Rock Gate underground.
Wow, didn't know about a shack there. Do you have a pic of that?
I think it would be a good idea to research what he may have done with the pipes. I'm on my phone and it's hard to navigate the site to find it but above the entrance I found a pipe stuck in the coral block that points straight up...as you probably know, the bell at the entrance hangs from a horizontal pipe pointing inside. They are not in alignment but they still may be connected internally. Definitely something about the pipes!