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I wrote this for one of the alternative history or high strangeness subs a while back, but you may appreciate it too,
I don't think the Germans made die glocke themselves. It was allegedly a bell shaped device depicted with a swastika* on the side and some kind of nondescript "occult symbols" around the skirt.
https://en.m.wikipedia.org/wiki/Die_Glocke_(conspiracy_theory) I think there's a decent chance it's real and that the relic was part of a vimāna (maybe a power source), recovered archeologically during one of those SS expeditions in the 1930s that inspired Indiana Jones adventures.
The Germans thought they were descended from a long lost ancient global super civilization, Atlantis stuff, and they
spent real resources trying to find evidence of it archeologically. I think they really thought they could find part of a vimana to reverse engineer and that's where The Bell enters the story. They could have looted it from a ruined temple where it had been preserved for ages as a holy relic by monks that didn't understand what it really was, or they could have recovered it from a collapsed tibetan cave, something like that. There have long been rumors that some recovered UFOs are archeological, something like this scenario could be the source for those stories.
Later, after the war I suspect it was captured by the allies and quietly spirited away to the United States along with a bunch of other German equipment and scientists to continue their work to reverse engineer the device, because later still at a place called Kecksburg Pennsylvania a UFO that made several course changes crashed in the woods outside of town. Very shortly after, a group of soldiers arrived, formed a perimeter and hauled the thing out on a flatbed truck, but before that happened some locals got a look at the device and described it as acorn shaped, with "alien" hieroglyphics around the rim.
https://en.wikipedia.org/wiki/Kecksburg_UFO_incident
Compare the images on the two wiki pages above, the devices depicted are suspiciously, even cartoonishly similar, no? Perhaps those "alien hieroglyphics" reported in so many cases, from Rendlesham to Roswell, are actually some kind of ancient language like the indus valley script which almost nobody outside of a very narrow slice of academia would recognize today. One more thing, die glocke the nazi bell is depicted with a swastika prominently displayed on the side, which gives the impression that the Germans made it, however, the swastika also just happens to be one of the 400+ characters in the indus valley script, and in this case may simply be an ancient invocation of good luck on a potentially hazardous device, kind of like a yellow danger sign on heavy machinery, or maybe more like when Chick-fil-A prints Bible verses on their fry containers.
en.m.wikipedia.org
Edit, ignoring the alleged inner workings, the fluxliner ARV's outward appearance looks like it could be a reverse engineered US made version of the device.
https://www.reddit.com/r/UFOs/s/OUct4z8V0f
Edit 2,
https://en.m.wikipedia.org/wiki/Vimana
*A note on the swastika symbol itself, it's found all over the ancient world, from a 14k year old mammoth ivory carving found in Ukraine, to a 6k year old cave painting in North America. The Navajo called it whirling logs, and it represented luck and victory, it meant more or less the same thing to the buddists too. I think that Nazis thought the symbol was evidence, a remnant of the global super civilization (atlantis/mu/lemuria or whatever you want to call it) that got passed down through time to all these seemingly separate groups all over the world and chose it for themselves in an attempt to connect themselves to the past.""
