In the world, there were gods who obeyed the rules, whether good or evil. But there were also evil gods who defied the rules. When a traverser was confronted by the rules that he could never conform to, the resulting collision marks the beginning of the story of an evil god… This is the story of a good man who transformed into a great jellyfish, then traversed his world to arrive at a world of swords and magic. His journey of searching and exploring eventually led to him remaking nature and changing the world.
If someone were to drill into that huge tube, one would see the inner walls densely wound with metal coils. There was not a single gap. Close to the top of the tube, there was even a metal coil that had already been burnt up, slowly falling.
Of course, there were many more structures, complicated beyond the realm of human understanding, which was another matter.
According to the artist friend (who was artistically talented but lived a little poorly due to his enthusiasm for DIY projects), this was called a coil-type electromagnetic gun. The initial speed of the projectile was slow. It relied on a long barrel to provide acceleration. But if the barrel was long enough, the power supply sufficient, and the design perfect, it could launch extremely heavy things at frighteningly high speeds.
It would be theoretically possible to shoot a one-ton mass of iron at the speed of the Third Cosmic Velocity without difficulty.