A secondary access shaft led to a vaulted chamber and a deep well shaft. This may have been an aspect of the cult of Osiris, although it may have been to find the water table. A passage led northwards, past another lateral chamber and turned westwards. This led to an antechamber and vaulted burial chamber, with a sidechamber to the south. The burial chamber was encircled by a unique series of passages that may have reference to the birth of Osiris. A large sarcophagus was found within the burial chamber; it is larger than the doorway and the tunnels, showing that it was put in position when the chamber was being constructed and it was open to the sky.