"Although people had sensed something was off with the city walls for some time, the issue couldn't be detected due to the new materials used by Doctor B. Moreover, on the very first day Doctor B disappeared, the city's upper echelon was quite anxious. This was because Doctor B's leadership was crucial for matters concerning both the Concentrating Stone and the Life Water.
It wasn't until two days later that the Austin City high-ups finally conducted a thorough investigation, and the truth came to light. It turned out that all of it was a scheme by Doctor B and Tis. We were also involved in digging tunnels and secretly transporting materials away. How else could millions of pounds of supplies vanish in the blink of an eye?