The Underground Facility is a location hidden beneath Emil's Mansion in . You'll visit this location as part of the main storyline, but you'll likely return later on as it's a great place to farm for various weapon upgrade materials, and is also accessed as part of an optional quest too.
This labyrinth-like laboratory can be a little annoying to navigate, which is why it's well worth making sure you find the map for it as soon as possible. Unlike most maps, the map for the Underground Facility cannot be purchased from a merchant but is actually hidden within the Underground Facility itself.
How to Enter the Underground Facility
You access the Underground Facility as part of the storyline anyway, but in case you've forgotten how to get there, you can access it from the circular courtyard in Emil's Mansion. Simply interact with the glowing spot behind the fountain, which will open up a new passageway beneath the stairs on the right of the screen.
Where to find the Underground Facility Map
The Underground Facility Map is hidden away in a hard-to-spot crate on the first floor of the area. It's just before the doors that unlock with the KA Keycard, as shown in the image above.
Simply break the crate and then interact with the object/arrow indicator to collect the map. As this area features three ꦉdifferent levels, and so three diffe🃏rent maps, being able to view exactly where you are and where you need to go is super helpful.