No one uttered a single word in the underground space. The silence was suffocating. 

Xia Lei speedily checked the side and front walls, his X-ray vision penetrating beyond the walls with ease. Despite that, behind the walls were concrete. There was no means for him to view past it. 

Xia Lei turned to the right wall. Behind the walls were also concrete. 

Following that, Xia Lei moved to look at the left wall. This was when he finally discovered a hidden space behind it. It was a tunnel that was about one hundred and fifty metres wide and stretched forward with no end in sight. Four fully-armed combatants were stationed inside the tunnel. All of which had tall, well-built bodies that were carrying the best American weapons. The pins of the M41A assault rifles were unlocked, they would be able to open fire at any given notice. The wall shielding them was nothing more than aluminium alloy, particleboard and spray paint. Surveillance footages were even made available to them through monitors on the wall. 

Evidently, behind the left wall was where the emergency evacuation route of the...