Below the surface layer were remains a pipe that drained the prison courtyard in the east and crossed the Shādhaliyya compound westward, toward the sea. The pipe, made of poured concrete, was coated with a dark brown glaze. A layer of fill consisting of modern refuse (thickness 0.5 m) was removed from the entire area. The fill below this layer was light gray sandy soil that contained fragments of pottery vessels dating to the Ottoman period (nineteenth–twentieth century CE). The remains of a vault built of medium-sized kurkar ashlars (Fig. 2) and oriented in an east–west direction were discovered at a depth of 1.5 m. It belonged to the western wing of the Knights Hospitaller center dating to the Crusader period, which was excavated in 1991–1998 (Avissar and Stern 1995). This find confirmed the existence of a western wing, which until now was only speculated. The vault was damaged when Dahar al-Omar (1750–1775) built his palace, which the British Mandate authorities turned into a prison. With the discovery of the vault, and following very heavy rain that filled the excavation square with alluvium, it was decided to suspend the trial excavation due of safety issues and the danger of damaging the remains.