You used to be able to jump into a vent in the hangar and go into a room with a circular table n stuff.
As of shadowkeep and new light, the vent you needed to enter has been blocked off. But after glitching outside the map, I've found a guy chilling in the room with a blackboard of some kind.
I think bungie might find a use for that room soon.
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What about the speakers room? They built a room for the speaker after he died.