Underground Research Institute.
As the name implies, it is a "research institute" hidden underground... However, Central City is a floating city, with numerous buildings suspended in the air, so to reach the "underground," one needs to take the exclusive "Earth Core Secret Stairs."
The airship stopped at a floating building.
After Gu Shen and Fisher verified their identities, they entered the secret stairs on the top floor... Although there was no sense of vibration inside, Gu Shen released his "spirit" and watched the rapid descent of the secret stairs from outside!
"First time seeing this thing?" Fisher asked with a smile.
"Yes, the technology of North Continent... always manages to surprise people." Gu Shen replied earnestly, "A 'secret stair' nearly a thousand meters long, leading directly to the underground... this is no simple engineering feat."
Fisher's response was quite intriguing: "Compared to Her Majesty the Empress's 'Furnace', these are nothing."
"Of course..."
