Facing charges of helping illegal immigrants land on Greek soil, 25 volunteers are being trialed in Greece, including the sister of a Syrian Olympic swimmer; who made headlines several years ago for rescuing refugees who were facing the risk of death in the Mediterranean. Sara Mardini, sister of German-based Yusra Mardini, is one of 25 aid workers who are facing criminal charges for assisting people on the island of Lesbos ...