This ceremony is the same as when installing the first pole (SaoAke) for the main house. The Brahman will have to guide you for the best location according to ancient belief of how the Naga is positioned for that month. He will have to locate the stomach of the Naga, and that's where you will begin to dig. Please don't ask me of how the Naga got into this story. The Naga is in most of the religious stories, and the branching out is very complex.