The two continued walking down the ramp, their footsteps amplified several times in the enclosed space.
"Tap, tap, tap."
The sound of leather shoes striking the ground was crisp and rhythmic, echoing layer upon layer, like the heartbeat of some giant beast.
As they delved deeper, the surrounding air noticeably became cooler and crisper.
The unique underground dampness mixed with a faint scent of rust and concrete penetrated the nostrils everywhere.
Under the bright white light of the iodine-tungsten lamp, the surroundings were revealed in minute detail.
There wasn't a hint of bare earth or rocks; all that met the eyes were blue-gray high-grade concrete walls.
Though a thick layer of dust had accumulated on the surface, it remained smooth and intact, showing no signs of cracks or seepage.
Fang Cheng reached out to touch the wall beside him.
