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 the public. Ramesses II's son and eventual successor, Merenptah's tomb has been open since antiquity; it extends 160 metres, ending in a burial chamber that once contained a set of four nested sarcophagi. Well decorated, it is typically open to the public most years. The last kings of the dynasty also constructed tombs in the valley, all of which follow the same general pattern of layout and decoration. Notable amongst these is the tomb of Siptah, which is well decorated, especially the ceiling. The first ruler of the dynasty, Setnakhte, actually had two tombs constructed for himself. He started excavating