PREVIEW
... into the warehouse and opened a hidden secret door on the warehouse wall. Inside the secret door was a spiral staircase leading to the ground.
Walking down the stairs, two people and one cat came to a huge underground space.
The height of this underground space is about 10 meters, the depth is nearly 100 meters, and the area is almost the size of a football field.
The whole underground space is like a huge high-tech exhibition hall, which is full of various high-tech ...
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