The Krusty Krab surveillance room is a room that only appears in the episode "Truth or Square."
It is a light red room with many screens and has one dark orange chair. It has live surveillance footage from all over Bikini Bottom.
Role in episode
When everyone was stuck in the air vent, it was used to spy on SpongeBob's pineapple, Patrick's rock, Sandy's treedome, and apparently the room itself. When Squidward discovers this, he is angry at Mr. Krabs. Mr. Krabs fumbles for an excuse and said the room was built so he can make sure they floss after every meal. This room seems to be only accessible by going through the air vent, yet Mr. Krabs still knew about it. That means Mr. Krabs knew the air vent path well, and hid it from everyone.