The “giara” of Siddi is a typical basalt plateau situated at circa 350 m a.s.l., in the historic region of the Marmilla, in southern Sardinia. Around the edge of the plateau stand sixteen nuraghi and in the centre is the famous tomb of the giants of Sa Domu ‛e s’Orcu, excavated in the 1980s by Ubaldo Badas. The investigation of another corridor nuraghe, the nuraghe of Sa Fogaia, began in the 1990s and is nearly complete. Most of the nuraghe on the Siddi plateau are simple single-towers, some with courtyard in front. The three year excavation project foresaw a limited number of trenches in six nuraghi of the nuraghe territorial district, which above all aimed to collect data and samples for the reconstruction of the plaeo-environment (pollen, anthracological, carpological, phytolite and faunal analysis) and to propose a series of new C14 dates centred between the terminal BM and the BR. In the 2009 campaign excavations were undertaken on the nuraghe Sa Gruxi, a single-tower with courtyard, and the Sa Conca ‛e sa Cresia complex corridor nuraghe which originated in the Middle Bronze Age as a corridor nuraghe and was restructured as a tholos in the Late Bronze Age. Only the excavation at Sa Conca ‛e sa Cresia proved of use for the project. It explored a corridor with a complex stratigraphy which will be taken down to the bed-rock during the 2010 campaign. In fact, the lower layers revealed domestic structures of the Middle Bronze Age 3 with hearths, pottery decorated in the metopal style and abundant faunal and carbonised vegetal remains.