An hour had passed since Noland Lee began exploring the 21st underground layer.
In a corner of the 21st underground layer of Sector 6.
Noland crouched in a cluttered room filled with broken crates, the floor covered in broken wooden boards, wood shavings, and bent nails.
This was an abandoned underground warehouse, occupying an area of about 300 square meters.
There were hundreds of warehouses like this one in the 20th underground layer. Along with similar workshops, steam boiler rooms, and liquid cooling rooms occupying 300 or even 500 square meters, there were at least two hundred of them in the 20th underground layer.
He found this out after finding a map.
The map, left on a mucus-covered carpet, was about 4 cm thick when folded palm-sized.
When it was spread out on the floor, the densely packed corridors and room layouts appeared before him. There were also numerous hand-written numbers and notes beside the layouts.
