[Tracking Rats - Ruby and Fade]

Ruby isn't exactly an electrician. Seeing that it's going to be nigh-impossible to get at the battery, she sighs. "We can look at this once we're back aboveground, anyway."

They continue deeper in, and there's a surprised intake of breath when they see the dead mutant rat-people.
"Definitely something worse than just rats. But someone's already dealt with them. Took the heart every time. That's not a good sign."
She crouches down to get a closer look at the bloodstains. Let's see if she can remember her training about tracking and analyzing a scene.
"Or several someones...?"

[Breakthrough Day]

Alice has a deactivated copy he can look at. She gets it out of her bags, along with another stick of gum.
It's a force-field generator. Controls come in here, power comes in there, and then it skips over some intervening space to create an invisible wall. From the flanges and wires it seems that it helps it function if it's as spread out as can be.
"Wish I had the time to. But you're right, there's always something we can do with what we have it reach."