Divers worked in shifts to try to get into the sunken vessel, but strong currents would not allow them to enter, said coast guard spokesman Kim Jae-in. The water temperature in the area was about 54 degrees Fahrenheit, cold enough to cause signs of hypothermia after about 90 minutes of exposure. The captain of the Sawol, identified by broadcaster YTN and the Yonhap news agency as Lee Joon-seok, 68, was questioned by the coast guard and made a brief, videotaped appearance, although his face was hidden by a gray hoodie.