Intruder!
They entered the plain room with no furniture inside, the only thing that Veronica noticed are the two closed doors.
"What is this room?" Veronica asked curiously.
"It's the room that connects the main residence and the wide facility that was built underground," Nathan replied.
"Really-?" Veronica asked. She didn't expect that there is an underground facility in this area.
"Yeah... and we're about to enter that area," Nathan said and walked towards the closed door on the right.
He opened the door and they stepped into the hallway.
Veronica saw the long hallway and several doors, although curious about what's inside those doors, she kept her mouth shut so that she and Nathan can concentrate on their mission.
They walked in the silent hallway for a few minutes, Nathan produced a key from his hand and inserted it on the doorknob. They entered the room quietly. Nathan locked the door.