Refugees and migrants arrive aboard the passenger ferry Blue Star Patmos from the islands of Lesbos and Chios, at the port of Piraeus, near Athens, Greece, October 25, 2015. Over half a million refugees and migrants have arrived by sea in Greece this year and the rate of arrivals is rising, in a rush to beat the onset of freezing winter, the United Nations said. REUTERS/Alkis Konstantinidis – RTX1T3Y9