One of the reasons I got hired at the first CI firm I worked for was "you are skinny, you will fit in the attics and crawl spaces". Owner of the company and most of his workers were, well, umm, "hefty" fellas.

I debated bringing my ferret to work on a couple of occasions to handle pulling some wire in tight spaces.
He probably could have done it, he was nimble and clicker trained. But he probably would have gotten bored halfway through the pull and taken a nap for a few hours. Ferrets have two speeds, frenzy and sleep. They cycle between them pretty rapidly, almost like they have narcolepsy.