Joseph Bonomi the Younger into debt and was eventually happy to accept a modestly paid commission to accompany Robert Hay on an expedition, via Malta, to Egypt in 1824. This began a lifelong interest in Egyptology. From 1824 to 1826, he was a member of Hay's expedition where he sketched many antiquities. At Abu Simbel in 1825, Bonomi – responding to Hay's demands for great accuracy – devised a drawing frame (a viewfinder-type device equipped with a sight and a string or wire grid) to help them draw the temples' interior decorations. The expedition then moved on to Kalabsha, where Bonomi laboured to produce
Prince Sadruddin Aga Khan Nations Educational, Scientific and Cultural Organization (UNESCO) in 1958, and became the Executive Secretary to its International Action Committee for the Preservation of Nubia in 1961. This initiative brought together archaeologists from Eastern Europe and the West at the height of the Cold War. The construction of the Aswan Dam threatened ancient Egyptian treasures including Abu Simbel, the temples of Philae and Kalabsha, and the Christian churches of Nubia. He would later describe it as "one of UNESCO's great achievements" because of the challenging historical context in which it took place—in particular the ongoing tensions in the Middle East and