ARGENTINA-SUBMARINE-MISSING

A mask in the deep diving rescue vehicle - the Pressurized Rescue Module (PRM) of the Submarine Rescue Diving and Recompression System (SRDRS) - brought by the U.S. Navy Undersea Rescue Command (URC) is seen before the module is installed on the Sophie Siem vessel, to support the Argentine government's search and rescue efforts for the missing Argentine submarine ARA San Juan, in Comodoro Rivadavia, Chubut, Argentina on November 25, 2017. The search for the San Juan "will continue day and night with help from 13 countries," navy spokesman Captain Enrique Balbi said late Friday. Hopes were boosted by the arrival later in the day of a giant Russian Antonov transport plane bringing an underwater robot that can scour the ocean at a depth of 1,000 meters (3,300 feet) below the surface. / AFP PHOTO / PABLO VILLAGRA (Photo credit should read PABLO VILLAGRA/AFP via Getty Images)