Relatives of the missing crew of the ARA San Juan submarine, hold a sign that reads in Spanish "ARA San Juan. On Eternal Patrol," after a ceremony remembering the one year anniversary of the disappearance of the submarine, at the Navy base in Mar del Plata, Argentina, Thursday, Nov. 15, 2018. The submarine disappeared in the South Atlantic with with 44 crew members aboard. (AP Photo/Vicente Robles)