Wastelands: Katy and Mike
A good DEX modifier does not mean a good Stealth modifier, particularly when most varieties of Mechframe are involved. An old city means old pipelines, and it's generally been easier to tap into those (when you own an assortment of power tools, blowtorches, and anachronistic(?) smithing equipment) compared to more obvious sources with wastland bred wildlife favoring it.
So of course there is a mutant raccoon under the bridge. But it's wearing what passes for clothes, and more importantly hasn't immediately gone full aggro. So Mike, for the moment, just stands still and stares.
It's an easy job, with no facial features.