Underground noises in unexpected places

So I’m driving down the road, just outside of small town, and I get a message like “You hear ‘hostile detected’ to the north and below.” I’m thinking there’s an unmarked science lab with turrets or something. I heard it a few times and kind of triangulated to a point and dug a downstair there. Nothing.

I went to the nearest house thinking I might find an entrance to this area in the basement. Couldn’t go downstairs because it says there was a brown chick blocking the way, lol. I mean, I get why the code would stop me, but I found it funny.

So what’s the deal? Should I be trying harder to see what’s under there?

BTW, there’s no sewer entrance in this tiny 4 house town. No subway either.

How deep did you end up digging? Could be pretty deep perhaps

As far as I understand there is something down there. However, it might be several levels down.

I only went 1 deep because rope is aa PITA to craft. I’ll just mark it for later if I come across a bunch of rope. I already have a science lab to explore.

Was probably one tile deeper then. Definitely worth checking out at some point.

Did you dig around a bit? It’s possible that you’ve just missed it by a few tiles…

One way to make check: Either (try again to) get into the basement of that house or into the hole you’ve dug and wait for a while… unless the turret got destroyed, you might hear another “hostile detected” and get an indication if it’s still deeper down or on the same level.

I had similar case about half year ago. Character was walking in the forest on the outskirts of a town (near my base-house), and heard gunshots from below. And as I discovered later, it was a lab. For my luck the town was small and had a subway station, and subway tunnel led me straight to the lab.

On new lab type,

By the way, those labs of new type, with rectangular shape, are typically on -2 or -4 level, so gigging 1 level below will be not enough to reach them

Is there any forest nearby? I have a few times found air ventilation installations in forested areas that allowed me to cilmb down to an underground railway leading to one or more labs.

I’ll check next time I’m that way. Right now I’m busy trying to find the bottom of an ice science lab.

But yeah, there is a forest. I just dug my hole next to the road.