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A rescued passenger from a ferry sinking off South Korea's southern coast, is carried by police and rescue teams on his arrival at Jindo port in Jindo, south of Seoul, South Korea, Wednesday, April 16, 2014. Dozens of rescue boats and helicopters are scrambling to save more than 470 people, including many high school students, caught on a ferry sinking off South Korea's southern coast, officials said. There are no immediate reports of causalities. (AP Photo/Park Chul-heung, Yonhap) ( South Korea Ship Sinking )

This undated photo shows South Korean passenger ship Sewol. A government office said Wednesday, April 16, 2014 the South Korean passenger ship carrying about 470 people have sent a distress call off the southern coast after it began tittering to one side. (AP Photo/Yonhap) ( South Korea Ship Sinking )

People watch 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.(AP Photo/Ahn Young-joon) ( South Korea Ship Sinking )

South Korean rescue helicopters fly over a South Korean passenger ship, trying to rescue passengers from the ship in water off the southern coast in 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. (AP Photo/Yonhap) ( South Korea Ship Sinking )

South Korea coast guard police officers work to rescue passengers from a South Korean passenger ship, at Mokpo Coast Guard in Mokpo, south of Seoul, South Korea, Wednesday, April 16, 2014. A government office said the passenger ship carrying about 470 people has sent a distress call off the southern coast after it began leaning to one side. (AP Photo/Cho Keun-young, Yonhap) ( South Korea Ship Sinking )

This photo taken at sea some 20 kilometers off the island of Byungpoong in Jindo on April 16, 2014 shows South Korea Coast Guard members in helicopters trying to rescue some of the 477 passengers and crew aboard a South Korean ferry that capsized on its way to Jeju island from Incheon. South Korean officials said as many as 295 people were still unaccounted for after a ferry carrying 477 passengers and crew capsized off the south coast on April 16. AFP PHOTO/YONHAPYONHAP/AFP/Getty Images ( 529007308 )

This photo taken on April 16, 2014 shows helicopters heading to aid 476 passengers and crew aboard a South Korean ferry sinking on its way to Jeju island from Incheon, some 20 kilometers off the island of Byungpoong in Jindo. Two bodies have been recovered and 368 people rescued from a South Korean ferry that capsized at sea on April 16 with 477 passengers and crew on board, a senior government official said. AFP PHOTO / South Korea Coast Guard/AFP/Getty Images ( 529006833 )

South Korean relatives wait for missing people at a harbor in Jindo on April 16, 2014 as South Korean rescue teams, including elite navy SEAL divers, raced to find up to 293 people missing from a capsized ferry carrying 459 passengers and crew -- mostly high school students bound for a holiday island. Two people -- a male student and a female crew member -- were confirmed dead as the vessel sank 20 kilometres (13 miles) off the southern island of Byungpoong. AFP PHOTO / JUNG YEON-JE/AFP/Getty Images ( 529008519 )

South Korean relatives of missing people react as they gather at a gym in Jindo on April 16, 2014 as rescue teams, including elite navy SEAL divers, raced to find up to 293 people missing from a capsized ferry carrying 459 passengers and crew -- mostly high school students bound for a holiday island. AFP PHOTO / JUNG YEON-JE/AFP/Getty Images ( 529008497 )

This aerial photo taken at sea some 20 kilometers off the island of Byungpoong in Jindo on April 16, 2014 shows debris floating next to a South Korean ferry (C) that capsized on its way to Jeju island from Incheon. South Korean rescue teams, including elite navy SEAL divers, raced on April 16 to find up to 293 people missing from a capsized ferry carrying 459 passengers and crew -- mostly high school students bound for a holiday island. AFP PHOTO/YONHAPYONHAP/AFP/Getty Images ( 529006978 )

This photo taken at sea some 20 kilometers off the island of Byungpoong in Jindo on April 16, 2014 shows South Korea Coast Guard members rescuing some of the 477 passengers and crew aboard a South Korean ferry capsizing on its way to Jeju island from Incheon. South Korea's coastguard said on April 16, it had recovered one body as it struggled to rescue 477 people -- mostly high school students -- from a capsized ferry off the southern coast. AFP PHOTO/YONHAPYONHAP/AFP/Getty Images ( 529005369 )

In this image taken from video from Mokpo Coast Guard, passengers from a ferry sinking off South Korea's southern coast, are rescued by South Korean Coast guard in the water off the southern coast near Jindo, south of Seoul, Wednesday, April 16, 2014. Nearly 300 people were still missing Wednesday several hours after the ferry carrying 477, most of them high school students, sank in cold waters off South Korea's southern coast. (AP Photo/Yonhap) KOREA OUT ( South Korea Ship Sinking )

A relative weeps as she waits for missing passengers of a sunken ferry at Jindo port, South Korea, Wednesday, April 16, 2014. The 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) ( APTOPIX South Korea Ship Sinking )

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) ( APTOPIX South Korea Ship Sinking )

In this handout image provided by the Republic of Korea Coast Guard, the rescue work by members of the Republic of Korea Coast Guard continues around the site of ferry sinking accident off the coast of Jindo Island on April 16, 2014 in Jindo-gun, South Korea. (Photo by The Republic of Korea Coast Guard via Getty Images) ( 485065585 )

In this photo released by South Korea Coast Guard via Yonhap News Agency, South Korean coast guard rescue passengers from a ferry in the water off the southern coast near Jindo, South Korea, Wednesday, April 16, 2014. The 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/South Korea Coast Guard via Yonhap) ( South Korea Ship Sinking )

Relatives wait for their missing loved ones 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) ( APTOPIX South Korea Ship Sinking )

This photo taken on April 16, 2014 shows rescued passengers, wrapped in blankets, being brought onto land in Jindo after a South Korean ferry carrying 477 passengers and crew capsized on its way to Jeju island from Incheon. South Korea said on April 16 that two people were killed and 368 rescued from a ferry that capsized at sea with 477 people on board -- mostly high school students -- as divers searched for scores still missing. AFP PHOTO/YONHAPYONHAP/AFP/Getty Images ( 529004973 )

In this handout image provided by the Republic of Korea Coast Guard, the rescue work by members of the Republic of Korea Coast Guard continues around the site of ferry sinking accident off the coast of Jindo Island on April 16, 2014 in Jindo-gun, South Korea. (Photo by The Republic of Korea Coast Guard via Getty Images) ( 485065575 )

In this handout provided by Donga Daily, The Republic of Korea Coast Guard work at the site of ferry sinking accident off the coast of Jindo Island on April 16, 2014 in Jindo-gun, South Korea. (Photo by Park Young-Chul-Donga Daily via Getty Images) ( 485065583 )

In this handout image provided by the Republic of Korea Coast Guard, the rescue work by members of the Republic of Korea Coast Guard continues around the site of ferry sinking accident off the coast of Jindo Island on April 16, 2014 in Jindo-gun, South Korea. (Photo by The Republic of Korea Coast Guard via Getty Images) ( 485065571 )

Relatives of missing people wait at a Jindo port on April 16, 2014 in Jindo-gun, South Korea. (Photo by Chung Sung-Jun/Getty Images) ( 485049349 )

Relatives of missing people wait at a Jindo port on April 16, 2014 in Jindo-gun, South Korea. (Photo by Chung Sung-Jun/Getty Images) ( 485049317 )

A Woman cries at Jindo port on April 16, 2014 in Jindo-gun, South Korea. Two people are dead, and more than ninety are missing as reported. The ferry identified as the Sewol was carrying about 470 passengers, including the students and teachers, traveling to Jeju island. (Photo by Chung Sung-Jun/Getty Images) ( 485044491 )

Divers search the Sewol, a 6,825-ton passenger ship owned by Chonghaejin Marine Co., 20 kilometers off of Jindo, South Korea, on Wednesday, April 16, 2014. South Korea's government said 293 people are missing after a ferry carrying hundreds of high school students sank en route to the resort island of Jeju. At least two people, including a student, died in the accident. Source: Yonhap News via Bloomberg EDITOR'S NOTE: NO SALES. EDITORIAL USE ONLY. ( SKOREA SINKING SHIP )

This aerial photo taken at sea some 20 kilometers off the island of Byungpoong in Jindo on April 16, 2014 shows South Korea Coast Guard members searching for passengers near a South Korean ferry (bottom R) that capsized on its way to Jeju island from Incheon. South Korean rescue teams, including elite navy SEAL divers, raced on April 16 to find up to 293 people missing from a capsized ferry carrying 459 passengers and crew -- mostly high school students bound for a holiday island. AFP PHOTO/YONHAPYONHAP/AFP/Getty Images ( 529006664 )

This aerial photo taken at sea some 20 kilometers off the island of Byungpoong in Jindo on April 16, 2014 shows rescue operations underway for passengers on a South Korean ferry (C) that capsized on its way to Jeju island from Incheon. South Korean rescue teams, including elite navy SEAL divers, raced on April 16 to find up to 293 people missing from a capsized ferry carrying 459 passengers and crew -- mostly high school students bound for a holiday island. AFP PHOTO/YONHAPYONHAP/AFP/Getty Images ( 529006976 )

In this handout provided by Donga Daily, The Republic of Korea Coast Guard work at the site of ferry sinking accident off the coast of Jindo Island on April 16, 2014 in Jindo-gun, South Korea. Four people are confirmed dead and almost 300 are reported missing. The ferry identified as the Sewol is reported to have been carrying around 470 passengers, including students and teachers, as it travelled to Jeju island. (Photo by Park Young-Chul-Donga Daily via Getty Images) ( 485065581 )

South Korean relatives of missing people react as they gather at a gym in Jindo on April 16, 2014 as rescue teams, including elite navy SEAL divers, raced to find up to 293 people missing from a capsized ferry carrying 459 passengers and crew -- mostly high school students bound for a holiday island. Two people -- a male student and a female crew member -- were confirmed dead as the vessel sank 20 kilometres (13 miles) off the southern island of Byungpoong. AFP PHOTO / JUNG YEON-JE/AFP/Getty Images ( 529008398 )

Relatives wait for their missing loved ones 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) ( South Korea Ship Sinking )

In this image made from video from South Korean Coast Guard, a passenger of a ferry sinking off South Korea's southern coast is hoisted onto a Coast Guard helicopter off the southern coast near Jindo, south of Seoul, Wednesday, April 16, 2014. (AP Photo/South Korean Coast Guard via AP Video) ( South Korea Ship Sinking )

South Korean coast guard officers try to rescue passengers from a ferry sinking in the water off the southern coast near Jindo, south of Seoul, South Korea, Wednesday, April 16, 2014. (AP Photo/Yonhap) ( APTOPIX South Korea Ship Sinking )