Old Valen
As soon as Nero stepped out of the rocket fuel storage, he paid much closer attention to this place. The hallways were well lit, and vaguely reminded him of the corridors in schools. There was a thick white border around every door and window, while the walls and floor carried neutral colours.
The ventilation in here was perfect, making it seem like he was breathing fresh air rather than processed air, and the temperature was extremely comfortable.
It seemed that, compared to the rest of the research facility, which was just a little too cool, this place had been specifically designed to be occupied by humans for long durations of time.
He looked up and saw boards with directions pointing towards different directions of the Vault, and was incredibly surprised to discover that compared to other Eldrim texts he had encountered so far which were in an entirely different language, the boards contained Old Valen.