The Undercity is a sewer network that consists of almost 60 connected interiors, which create a massive underground grid underneath the south side of Los Santos.
Where the screenshots were taken (x, y, z, heading), ready to paste into a config or teleport to:
vector4(219.28, -1277.6, 29.35, 172.24)Add this line to your server.cfg. The installation guide covers the rest.
server.cfg
ensure nopixel-undercity