Martians? [Sometimes he really loved how the Cap was stuck in the past just as much as he was at times.] Pretty sure that means they're just from Mars there, bub. He's an alien, but he ain't a martian. [Was he making fun of Captain America? Never. That would be completely unpatriotic. ....good thing he's Canadian.]

Regardless, there are cameras, the wires would be a good place to start.