Season 1 of Modern Warfare 4 adds a brand-new DMZ map, but it isn’t accessible from the menus. In this DMZ guide, we’ll show you how to find the entrance to X01 on Hajin, and we’ll provide some tips to help you survive this new extraction experience in Modern Warfare 4. What is the X01 map in MW4 DMZ mode? X01 building X01 is a smaller DMZ map set within a weapons facility near the northern border of North Korea.