JINDO, South Korea — After days of rescue efforts stymied by strong currents and poor visibility, divers made their way into a capsized South Korean ferry on Sunday and began bringing out bodies, starting what officials said would probably be weeks of grim recovery operations.

As of Sunday afternoon, they had recovered 13 bodies from inside the overturned and sunken ship, including three pulled out through a broken window late Saturday. Another two bodies were found by Sunday evening. Officials believe that many of the 242 people still missing since the vessel went down on Wednesday morning, a majority of them high-school students on a field trip, were trapped inside in one of South Korea’s worst peacetime disasters. The official death toll rose on Sunday to 58.

Of the 476 people who were on board, all of the 174 known to have survived were found in the hours immediately after the ship sank.