There is an extremely high concentration of large stones indicating that the fill is anthropic. The fact that the placement of the stones widens as the cistern deepens leads us to believe that the cistern itself opens as it gets deeper. A terracotta altar (special find 487) in the fill may indicate possible votive activity (?). The SU is probably related to abandonment activity. Large stones within the fill indicate that it might comprise demolition debris from the house itself. During post-excavation study, this feature was reinterpreted as backfill of the cistern in Space 7.