[Nanobots]

"How?"

 Linri looked at the phone in his hand, then to the wardrobe, then to phone again. First of all, they were on the ground floor and behind this room should be open space. How in the hell can there be a cave here?

Okay, let's forget the whole physics aspect of the situation and think about the other problem. How was he supposed to go in there? There weren't any scratches on the floor so this wardrobe wasn't going to move like the hidden compartments behind bookcases. What if he pushed it himself? 

Linri tried to push it, but the thing did not even move an inch. How else can he get inside? While Linri was thinking about this question Selim popped out of the wall.

"What's taking you so long?"

"Unlike you, I can't go through solid matter like it didn't exist, okay? And this stuff just doesn't want to move."

"Your loss."

"What did you see?"