During their stay in the port of Piraeus, the public will be given the opportunity to visit them from 09:00 to 19:00.Children more than 12 years old are allowed to enter the submarine.At the same time, archaeological sites, monuments, and museums open their doors to welcome the public with free entry.As has been the case based on a decision of the Ministry of Culture in recent years, entry to museums belonging to the State, as well as archaeological sites, are free for all visitors.OXI Day on October 28, 1940, commemorates the anniversary when former military general and Prime Minister of Greece, Ioannis Metaxas said: “OXI” (NO) to an ultimatum made by Italian Prime Minister Benito Mussolini, an ally of Nazi leader Adolf Hitler.