A relative of missing people checks name list in Jindo, South Korea, April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin) 

 

South Korean relatives of missing people react as they gather at a gym in Jindo on April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin)

 

A relative of missing people checks name list in Jindo, South Korea, April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin)

 

South Korean relatives of missing people wait at a gym in Jindo on April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin)

 

South Korean relatives of missing people wait at a gym in Jindo on April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin)

 

South Korean relatives of missing people react as they gather at a gym in Jindo on April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin)

 

South Korean relatives of missing people react as they gather at a gym in Jindo on April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin)

 

South Korean relatives of missing people react as they gather at a gym in Jindo on April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters.(Xinhua/Yao Qilin)

 

Workers prepare beds for missing passengers's relatives in Jindo, South Korea. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters. (Xinhua/Song Chengfeng)

 

Rescue members wait outside a gym in Jindo, South Korea, April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters. (Xinhua/Song Chengfeng)

 

A rescue member takes interviews by media in Jindo, South Korea, April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters. (Xinhua/Song Chengfeng)

 

Relatives of passengers aboard the sank ship wait for news on missing passengers inside a gym in Jindo, South Korea, April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters. (Xinhua/Song Chengfeng)

 

Relatives of passengers aboard the sank ship wait for news on missing passengers inside a gym in Jindo, South Korea, April 16, 2014. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters. (Xinhua/Song Chengfeng)

 

Photo taken on April 16, 2014 shows a gym for missing passengers's relatives to stay temporarily in Jindo, South Korea. A passenger ship with 462 people aboard, mostly high school students, sank in waters off South Korea's southwest coast Wednesday morning, leaving at least four people dead and 284 others missing, local media reported citing the central disaster and safety countermeasures headquarters. (Xinhua/Song Chengfeng)