An expert who opened the door explained, "Entities of this level usually have built-in lighting that can last for ten or twenty years without being affected by external power sources."
Another black-armored warrior immediately stepped forward and extended the probe of the multi-functional gas detector into the doorway.
The values on the instrument screen fluctuated rapidly before stabilizing within a safe range.
The soldier quickly reported: "The air composition is safe, the oxygen content is normal, and there are no common toxic gases."
"Go in," Chen Yin gave a brief order and went in first.
Ten black-armored warriors followed behind Chen Yin, each carrying a powerful flashlight.
Several experts were also given permission to go inside.
Behind the door is a straight, short tunnel, about forty meters long and five meters wide, with a rough but flat cement surface.
The walls on both sides are reinforced concrete, painted with a faded military green paint.
At the end of the tunnel, several military green heavy trucks could be clearly seen parked there.
The lighting also comes from over there.
Upon exiting the tunnel and seeing everything on the other side, including Chen Yin, everyone who had entered seemed to hold their breath.
This is an unimaginably huge man-made cave!
The walls, ceiling, and floor were all covered with thick concrete.
The cave ceiling is over twenty meters high. Looking up, you can see the welded steel frame and the neatly arranged explosion-proof lights.
The row of lights in the middle was on, casting a soft, cool white light that illuminated the entire empty cave.
The huge cave was filled with weapons.
It stretches as far as the eye can see!
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