Valley of the Kings rains. There is currently little year-round rain in this part of Egypt, but there are occasional flash floods that hit the valley, dumping tons of debris into the open tombs. The quality of the rock in the Valley is inconsistent, ranging from finely-grained to coarse stone, the latter with the potential to be structurally unsound. The occasional layer of shale also caused construction and conservation difficulties, as this rock expands in the presence of water, forcing apart the stone surrounding it. It is thought that some tombs were altered in shape and size depending on the types of rock the
Valley of the Kings 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