4 ms·batteries don’t last as long as a hole. some holes already exist.by gameswithgo 6y agobatteries don’t last as long as a hole. some holes already exist.eitland 6y agoMeaningfully deep holes in the ground require some maintenance as well.falcolas 6y agoOne of the biggest is groundwater removal. Behind that would be the maintenance of shoring materials in the face of earthquakes, and ensuring that it remains straight in the face of earth movement.