Both were still somewhat puzzled.
Zhang Xiaomeng touched his forehead and explained, "Think about it, the things hundreds of meters underground are divided into three layers, plus the laboratory level, making a total of four layers."
"Moreover, with such a huge space, to transport all these mounds of soil out would certainly be a major project that the police would definitely discover."
"Or these people might be reported."
"But why has such a large project gone unnoticed by anyone?"
"There was no military research base or anything of the sort here back then."
Luo Shuxian's eyes suddenly lit up, "Xiaomeng, are you suggesting that the dug-out clumps of earth and stones weren't transported out from above but from below?"
"Smart." Zhang Xiaomeng nodded.
Li Muling also understood the twists and turns, "That is to say, there must be a cave or something here for disposing of the soil."
"But what does this have to do with the exit we were talking about?"
