Song Ning stopped searching in vain.
She calmed down and thought things through carefully.
This group of people, whether abducting their captives earlier or interrogating Li Zekun afterward,
had remained coolheaded and cold-blooded throughout.
Their movements were well trained, and even their retreat followed a procedure, without the slightest panic.
That proved they had prepared contingency plans beforehand.
Both aboveground and down here, they had their own security protocols.
If they could design such a clever mechanism for the tunnel, perhaps they could also install some sort of self-protection system.
A tunnel entrance that closed after a delay, for instance.
Just like what had happened now, shutting Song Ning inside this space and leaving her to fend for herself.
There was room for so many people down here, yet there was no water, no food, and no sign of any drainage. It simply lacked the basic conditions necessary for survival.
That could only mean there had to be another space underground.
It had merely been deliberately sealed off.
There had to be something more to this space.
She just had not found it yet.
Song Ning decided to approach the problem from another angle and turned her attention overhead.
Because another requirement for surviving underground was air.
She had been down here for quite a while without feeling at all suffocated.
There had to be a ventilation system connecting this underground space to the surface, and it could not be small.
Otherwise, it could not keep the air circulating through such a large area.
Besides the old-fashioned gas lamps, electrical wiring had also been installed down here.
Since no one else had appeared even now, Song Ning simply switched on every light in the rooms and the corridor.
With all the lights on, the place immediately grew much brighter.
The