Song Heping's guess was indeed correct.
This small hill was essentially a minefield and a trap zone.
In just a thirty-meter stretch, Song Heping had dismantled two pressure mines and three tripwire mines.
If these were not hard to spot, then by the gate, a simple fence door was equipped with two cleverly set booby trap devices.
On the door's latch, Song Heping found a hand grenade hanging and didn't hesitate to inspect it for booby traps before disassembling it effortlessly.
Just as he was about to push the door open, he suddenly felt something was off.
The path that had come up the slope had each mine installed with a chain mechanism, yet this key spot of the door had none?
He became more cautious and turned around to check other areas.
That was when he discovered the issue.
At the turning door hinge, another wire was installed, concealed with vines, ready to spring open a fist-sized tripwire mine hidden in the grass beneath the soil the moment the door was pushed.