The crack was immense; two trucks could drive side by side. The pair walked about a hundred meters into it with their flashlights before reaching the end—a wall built of concrete and stones, fashioned in accordance with the natural shape of the crevice, blocking the path. In the center of the wall was a thick iron door, about six to seven meters wide, firmly closed. The door was painted with large red letters that, despite the ravages of time, faintly conveyed the warning: "Military No-go Zone, Unauthorized Personnel Keep Out."
The door was locked with an iron chain as thick as an arm, which was covered in red rust from years without treatment. The lock appeared to have rusted shut as well.
Faced with this massive and seemingly heavy iron door, Xiao Buli knew that it would be extremely difficult for an ordinary person to get inside. Not to mention figuring out how to break that arm-thick chain, but just pushing this huge object would take a lot of effort.