So between 4,000 and 3,000 BC the Mesopotamian Sumarian cultures do not practice any kind of burial. And then, about 3,000, in the early Dynastic Period, these burials start to reappear, and they reappear with a certain amount of conspicuous consumption, and this is the context for the royal burials at Ur. OK, so, the royal cemetery erm, consists of quite a number of pits, so these are little people, um, these are the, er, excavation workers who are coming down into the pits. So you get some sense of how really deep and how really difficult it was to construct these chambers.