A rescue swimmer holds onto migrants frantically trying to stay afloat after falling off their rubber dinghy during a rescue operation by the Malta-based NGO MOAS ship in the central Mediterranean

File photo:A rescue swimmer holds onto migrants frantically trying to stay afloat after falling off their rubber dinghy during a rescue operation by the Malta-based NGO Migrant Offshore Aid Station (MOAS) ship in the central Mediterranean in international waters some 15 nautical miles off the coast of Zawiya in Libya, April 14, 2017. REUTERS/Darrin Zammit Lupi