A mother weeps as she and others search for their children's names among a list of survivors rescued from a ferry that sank off the country's southern coast, at Danwon high school in Ansan, South Korea, Wednesday, April 16, 2014. Dozens of boats, helicopters and divers scrambled to rescue more than 470 people, including 325 students on a school trip from the high school, after the ship sank earlier in the day. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean President Park Geun-hye looks at the site where the Sewol sank from aboard a Coast Guard ship in waters off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. An immediate evacuation order was not issued for the ferry that sank off South Korea's southern coast, likely with about 290 people trapped inside, because officers on the bridge were trying to stabilize the vessel after it started to list, a crew member said Thursday. (AP Photo/Yonhap) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers aboard a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
A relative waits for their missing loved one at a port in Jindo, South Korea, Wednesday, April 16, 2014. A ferry carrying 459 people, mostly high school students on an overnight trip to a tourist island, sank off South Korea's southern coast on Wednesday, leaving nearly 300 people missing despite a frantic, hours-long rescue by dozens of ships and helicopters. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers aboard a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea.(AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
A relative of a passenger aboard a sunken ferry weeps at a port in Jindo, South Korea, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
Relatives of a passenger aboard a sunken ferry weep as they wait for the news on the rescue operation, at a port in Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers from a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea.(AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers aboard a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea.(AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers uses binoculars in search for missing passengers aboard their sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Fears rose Thursday for the fate of more than 280 passengers still missing more than 24 hours after their ferry flipped onto its side and filled with water off the southern coast of South Korea. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers aboard a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea.(AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers try to rescue missing passengers from a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers from a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea.(AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
Relatives arrive to wait for missing people at a port in Jindo,South Korea, Wednesday, April 16, 2014. A South Korean passenger ship carrying more than 470 people, including many high school students, sunk off the country's southern coast Wednesday after sending a distress call, officials said. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers aboard a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea.(AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
South Korean Coast Guard officers search for missing passengers aboard a sunken ferry in the water off the southern coast near Jindo, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea.(AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
A man watches a TV news program showing a sinking passenger ship, at Seoul Railway Station in Seoul, South Korea, Wednesday, April 16, 2014. The South Korean passenger ship carrying more than 470 people, including many high school students, is sinking off the country's southern coast Wednesday after sending a distress call, officials said. There are no immediate reports of causalities. The letters on the screen read " A passenger ship sank at 11:00 AM." (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)
A relative of a passenger aboard a sunken ferry weeps at a port in Jindo, South Korea, South Korea, Thursday, April 17, 2014. Strong currents, rain and bad visibility hampered an increasingly anxious search Thursday for more than 280 passengers still missing a day after their ferry flipped onto its side and sank in cold waters off the southern coast of South Korea. (AP Photo/Ahn Young-joon) (AP Photo/ Ahn Young-joon)