This is a CLEO myth that makes Terminator appear in Restricted Area (Area 69). It carries a Minigun and you'll have to use heavy weapons to kill it.
Once you get near the Area you'll find some Hydras and if you get close enough the mod will be activated. You will be able to access the Area 69 without being wanted, but once you finish Terminator, you'll be wanted if you enter the area again.