governmental groups led by the Archipelagos Institute of Marine Conservation in Greece said Tuesday the United Nations-backed plan to neutralize Syria's chemical stockpile while aboard a ship in the Mediterranean Sea was risky and unprecedented. Under Syria's agreement with the U.N. Security Council, its entire chemical arsenal is to be eliminated by June 30. Anastasia Miliou, research director of the Archipelagos Institute, said the neutralization of chemical weapons at sea is untested and fraught with dangers to the fragile Mediterranean ecosystem and the coastlines of Crete, Malta and Italy.