SOS Mediterranee organization members load lifevests on the Aquarius rescue ship moored at the port of Marseille, France, February 19, 2016. The rescue ship, equipped with speedboats, liferafts and a first aid station will patrol in the Mediterranean sea between Italy and Libya looking for boats in trouble and assist refugees in distress. REUTERS/Jean-Paul Pelissier

An SOS Mediterranee organization member loads lifevests on the Aquarius rescue ship moored at the port of Marseille, France, February 19, 2016. The rescue ship, equipped with speedboats, liferafts and a first aid station will patrol in the Mediterranean sea between Italy and Libya looking for boats in trouble and assist refugees in distress. REUTERS/Jean-Paul Pelissier

An SOS Mediterranee organization member loads lifevests on the Aquarius rescue ship moored at the port of Marseille, France, February 19, 2016. The rescue ship, equipped with speedboats, liferafts and a first aid station will patrol in the Mediterranean sea between Italy and Libya looking for boats in trouble and assist refugees in distress. REUTERS/Jean-Paul Pelissier

Lifevests and lifebuoys left by migrants float in the water near a beach during a rainstorm on the Greek island of Lesbos October 21, 2015. Over half a million refugees and migrants have arrived by sea in Greece this year and the rate of arrivals is rising with over 8,000 coming on Monday alone, in a rush to beat the onset of freezing winter, the United Nations said on Tuesday. REUTERS/Yannis Behrakis