Interesting article. So they call the entrance to the hidden underworld, the Osiris shaft? Sounds like they're having a little fun there:

Isis, with the help of her sister Nephthys, and Anubis and Thoth, magically located Osiris' body. Upon learning that his brother's body was found, Seth went to it and tore it into fourteen pieces and scattered them throughout Egypt. Isis once again found every part of his body, save his phallus (it had been eaten by the now-cursed Nile fish).

http://www.egyptianmyths.net/osiris.htm