In 1963 Yigael Yadin began excavating Masada. In 1964, Egypt, Jordan and Syria developed a unified military command. Israel completed work on a national water carrier, a huge engineering project designed to transfer Israel's allocation of the Jordan river's waters towards the south of the country in realization of Ben-Gurion's dream of mass Jewish settlement of the Negev desert. The Arabs responded by trying to divert the headwaters of the Jordan, leading to growing conflict between Israel and Syria.