In February 2017 we reviewed the new finds that then confirmed Keros as the oldest known island sanctuary in the world. Keros, is today a small uninhabited island in the middle of the Cyclades, in the Aegean, but between the years 2750 and 2550 BC. it housed a populous community, whose secrets are now beginning to be revealed.
And it is that about 4,000 years ago the promontory of Daskalio, which today is an islet, was connected to Keros through a narrow causeway. At that time, its view from the sea must have been impressive to say the least, because its entire surface had been covered with a thousand tons of white stone from Naxos Island (about 10 kilometers away), giving it the appearance of a giant stepped pyramid. /P> 
Archaeologists from three different countries working on the excavation project have finally gained access to what lies below the surface of those stepped terraces on the promontory-pyramid. A complex of drainage tunnels has been found that predates the famous canalizations of the Minoan palace of Knossos by about 1,000 years.
But also the remains of two metallurgical workshops with abundant metal debris and objects that include a lead axe, a copper dagger mold and dozens of ceramic fragments of metallurgy equipment, such as the mouth of a bellows. Evidence of metalworking had previously surfaced, such as an intact clay oven that has yet to be fully excavated and analyzed.
According to the director of the excavations, Michael Boyd of the University of Cambridge, metallurgical knowledge was evidently concentrated in Daskalio, at a time when access to these techniques and raw materials was very limited in other parts of the Mediterranean. What we see here with metallurgy is the beginnings of urbanization .
Archaeologists discovered the complex of drainage tunnels when excavating a stone stairway on the lower terraces, although they still don't know if it carried drinking water or sewage.
The press release issued by the Department of Archeology at the University of Cambridge describes the discoveries as extraordinarily sophisticated prehistoric monuments , which made the Daskalio promontory adjacent to the Keros sanctuary one of the most impressive sites in the Aegean during the early Bronze Age (circa 3000 BC).
About the previous discoveries in the sanctuary see our article New findings confirm Keros as the oldest island sanctuary in the world published in February 2017.