Strange Machine invented in WW2

I have started reading an interesting novel of a popular book author that deals with the enigmatic machine that was purportedly invented by German scientists before the end of the second world war. The prologue of the story tells about the creation of such device in a converted mine somewhere in the mountainous western parts of present day Poland in eastern Europe. The device, simply referred to as "Die Glocke" or The Bell has been secretly developed with the aim of creating a powerful weapon that could be used against the Allies to turn the tide of the war in favor of the weakening Nazis. unfortunately, there was not enough time for them to complete the project as the Allies has continued to advance in all fronts. It was too late to save Nazi Germany from being defeated. So the worried German military officials decided to destroy all technologies that were developed by their scientists and hide some sophisticated inventions in places that will remain unknown to the Allies for many decades to come, all of this has been carried out to preserve these advanced technologies until the rebirth of the Nazi state.

When I came up with this story, I did a research to confirm the validity of this incident. And, to my surprise, My search did produced several results that gives some historical accounts about it. The claim of the existence of such device has been first published by a Polish world war 2 soldier somewhere in the late 1990's. According to him, Soviet forces in world war 2 uncovered an evacuated mine which appears to have been converted to serve as a secret research and development facility. They found several dozen dead scientists which appears to have been murdered for their knowledge about the device. And a large spacious area in the facility left some traces of mechanical prints which suggests that a huge machine was once situated in that place. Great efforts has been made to search for the missing device. But until now, the hidden location of the strange device still remains unknown.