with additions, ever since. The second half of the century saw a more concerted effort to preserve, rather than simply gather, antiquities. Auguste Mariette's Egyptian Antiquities Service started to explore the valley, first with Eugène Lefébure in 1883, then Jules Baillet and Georges Bénédite in early 1888, and finally Victor Loret in 1898 to 1899. Loret added a further 16 tombs to the list, and explored several tombs that had already been discovered. During this time Georges Daressy explored KV9. When Gaston Maspero was reappointed as head of the Egyptian Antiquities Service, the nature of the exploration of the valley changed again. Maspero appointed English archaeologist Howard Carter as the Chief Inspector of Upper Egypt, and the young man discovered several new tombs and explored several others, clearing KV42 and KV20. Around the start of the 20th century, American explorer Theodore M. Davis had the excavation permit for the valley. His team (led mostly by Edward R. Ayrton) discovered several royal and non-royal tombs (including KV43, KV46 and KV57). In 1907, they discovered the possible Amarna Period cache in KV55. After finding what they thought was all that remained of the burial of Tutankhamun (items recovered from KV54 and KV58), it was announced that the valley was completely explored and that no further burials were to be found. Davis's 1912 publication, The Tombs of Harmhabi and Touatânkhamanou closes with the comment, "I fear that the Valley of Kings is now exhausted." After Davis's death early in 1915, Lord Carnarvon acquired the concession to excavate the valley, and he employed Howard Carter to explore it. After a systematic search, they discovered the actual tomb of Tutankhamun (KV62) in November 1922. Various expeditions have continued to explore the valley, adding greatly to the knowledge of the area. In 2001 the Theban Mapping Project designed new signs for the tombs, providing information and plans of the open tombs. Tomb development Location The earliest tombs were located in cliffs at the top of scree slopes, under storm-fed waterfalls (KV34 and KV43). As these locations were filled, burials descended to the valley floor, gradually moving back up the slopes as the valley bottom filled with debris. This explains the location of the tombs KV62 and KV63 buried in the valley floor. Architecture The usual tomb plan consisted of a long inclined rock-cut corridor, descending through one or more halls (possibly mirroring the descending path of