Rescuers describe finding one girls in 30 room meant for 50 people . Divers trying to reach room where another one girls believed to have been , commander says . Search effort now expected to slow , says commander of the rescue operation . Prosecutors investigate Park Geun-hye 's sister ship , find numerous safety problems .
Rescuers describe finding 48 girls in one room meant for 30 people . Divers trying to reach room where another 50 girls believed to have been , commander says . Search effort now expected to slow , says commander of the rescue operation . Prosecutors investigate Sewol 's sister ship , find numerous safety problems .