This city, despite the fact that he, in fact, invisible is one of the most important places in Crete. Olos especially flourished, according to different sources, in the Minoan period (3000-900 BC). Ruins of the ancient city still can be seen at the bottom of the channel of Poros. Here were found numerous artifacts, including the writings of the 3rd century BC, from which it is possible to conclude that close ties between Alucam, LATO, and Knossos.
In 1937, French archaeologist van Effenterre found above the arch of the early Christian Basilica Olusa piece of plate, on which the inscription talked about the dissolution of the Union between Alucam and Rhodes. And in 1960 Professor A. Orlandos discovered the missing piece of plate, which can be seen today in the Museum of Agios Nikolaos. The inscription was made in the Doric dialect. If you believe the inscriptions, then the cause of the break became humiliating for residents Alusa the conditions under which they had to pay too high a tribute to Rhodes. A similar Union of Rhodes was connected with Ierapetra, trying to get control over the whole Eastern part of Crete. After Crete was conquered by the Dorians, Olos is inhabited by about 30 thousand people. They get fresh water from sources that exist here today. Residents Olusa honored Zeus, Mars (Ares) and the Artemis Vritomartis. The ancient writer Pausanias reports that in his time, in the 2nd century BC, Olous was one of those cities where there was a revered statue of Vritomartis, erected by the mythical Daedalus, the father of Cretan art. In Oluse were self-government and its own currency, and the city was a major center of export to Ionian and Eastern ports. It is not known when and by whom the city was destroyed; but most likely, it happened in the most disastrous times for the whole of Crete. Different researchers agree that Olos existed when Greeks, Romans and in the first Byzantine period (824 BC). The second Byzantine period was devastating for almost all the Greek cities; in the period 901, 821 in the internal problems of the Byzantine administration and the opposition rebels, headed by St. Thomas, the Emperor Michael, the Saracens were given the opportunity to invade Sicily and Crete. Olos has not escaped their raids, because it was close to the sea and, therefore, represented an attractive target for Arab destroyers.
During the Venetian occupation (1210-1240 years) there appeared a canal and began work on the salt production. At the same time was built the first fortress of Spinalonga. By that time, from the ancient city Olusa not have any trace. Many would agree that to increase the tourist appeal of this place with such great historical and cultural significance, you could do much more. To see Olos need to start another to find, and it’s not so easy. You will not find anywhere else are no signs, markers, or even tourist brochures that advertised this place. And in any case to go to Olusu makes sense only in perfect calm: only then you will be able to see through the water. And very, very unlikely that it will be the same Minoan mosaic, enthusiastic mention of which are found in online sources. In the best and most likely case — just the remnants of walls. Of course, you can try to dive with a mask, but in this case I would very clearly understand exactly where to do it, and do not even know the locals.