Y-0 research center is a location in the far north, only very slightly northwest, in the Big MT in the Fallout: New Vegas add-on Old World Blues.
Two broken military trucks with broken cages block the entrance to this research center.
Next to the blocked "entrance", on the left side, is an active terminal that holds some information about the vending machines used at Sierra Madre.
Southwest of this location is a path that leads to the X-22 botanical garden.
This location appears only in the Fallout: New Vegas add-on Old World Blues.