On the track of builders in Oman

In Oman, a team of French scientists is performing extensive excavations at the site of Salut at the gates of the Arabian Desert. They are studying a monumental structure, the latest evidence of an ancient civilization of which almost nothing is known. Excavations uncovered a tower of large proportions, 30 metres in diameter, and two defensive ditches surrounding the building on the outside. There are good grounds to believe that the tower which is more than 5000 years old was built to protect drinking water resources. The researchers will need to continue their excavation to confirm this assumption and understand who these mysterious builders were.