Trial to Reach the Lower Level

"This is the place."

Old Ping led Li Luo to a circular building. He picked up shoe covers from the entrance and put them on.

Li Luo moved to take a pair as well, but Old Ping stopped her.

"You don't need them."

"I don't?"

"That's right."

After putting on the shoe covers, Old Ping took gloves, protective clothing, and a gas mask from the cabinet by the entrance, wrapping himself up tightly.

Li Luo stared in bewilderment, looking from Old Ping to the building. Unfortunately, the main door was locked tight, so she could not see anything inside.

"It's been a long time since anyone came here. I'm a little out of practice." Old Ping slowly "wrapped" himself up, checked for any gaps, and only then turned back to the door.

The door had a combination lock. Old Ping quickly entered several digits, and with a click, the door opened.

After he pulled open the outer door, there was unexpectedly another Airtight Door inside.

A huge wheel was mounted on the Airtight Door. Old Ping stepped forward and laboriously turned it to one side. Perhaps because it had not been used in so long, it caught at first before gradually turning smoothly.

Boom! As the wheel turned all the way, a heavy collision rang out.

The sound echoed through the entire building before returning to the entrance. Old Ping slowly pulled the door open, and a blast of icy air rushed out, accompanied by the sharp scent of disinfectant.

The smell made Li Luo frown, and she hurried back several steps. Old Ping, protected by all his gear, seemed unaffected.

Even after the door opened, the smell did not dissipate. Instead, it continued spreading outward, as if a constant breeze were blowing from inside.

"It's a Positive Pressure Environment