Sans puts a finger to his teeth in a gesture of "shhh," and goes to open the door. It leads out into a white hallway that looks like it was designed by Apple. There currently doesn't seem to be anyone around.

He creeps out into the hallway, looking around before turning back to Lambert in satisfaction.

"We just broke into the Aether Foundation's secret base."

Because that's how simple break ins are, when you're Sans.