Training facilities (1)

Turning her head to Xiao Yue, Ling Qingyu said. "Where's the training facility for firearms, room clearing, and others?"

"It's underground, where we made some space in the secret realm." Xiao Yue said. "As for the other courses, Sister Tang says she's preparing them on the open field in the backyard."

Ling Qingyu nodded. "Then, show me the firearm training area first." 

Xiao Yue led her underground through the elevators. Ling Qingyu knew, it was only with Athena's permission, that they could access the secret realm.

So, confidentiality and security were an absolute maximum. If her residence represented the city wall, her manor represented the castle inside the fortress, then, the secret realm represented a hidden chamber full of mechanisms.

Therefore, even harming the SWAT-like building was impossible without Athena's knowledge and action.