All Sinners In One Room

Walking in a still and cold hallway of the Society's underground facility could be a hair-raising experience for others who haven't been there or are oblivious of what is going on behind those walls. 

But Leo seemed unperturbed as he continued to saunter, making a couple of turns until he stopped in front of an empty wall.

The walls of the hallway may seem empty but in fact, it is not. There are a lot of concealed doors on those walls. Some lead to the research facility and surgical rooms, others are prisons disguised as decent rooms, one particular room is the Do's lair that will be used only if the log house is no longer safe for them, and some rooms are purposely designed to be torture rooms.

And the concealed door where Leo is standing in front is one of them. 

Placing his palm on the biometric scanner that is also concealed in the wall, he heard something inside the wall click.

The wall opened to reveal a huge darkroom.