I've done some work down in Mexico, you wouldn't believe some of the "solutions".
On one we were trying to find the origin of the power for the pump used to fill the gravity feed tank on the roof. Bare thhn or similar run across the flat roof, then into flexible pvc conduit down the exterior wall into the sand where the bare wires were buried about a foot down. Kind of figured it ran to the power shed, but none of the wire matched what was on the roof. After pulling it out of the sand it turns out this circuit was spiced together from random lengths, twice in the sand with wire nuts, and once in the pipe with just tape.