Air bags can be seen near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

Air bags can be seen near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

Air bags can be seen near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

South Korean coast guard and navy divers prepare to dive near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

Air bags can be seen near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

South Korean coast guard and navy divers prepare to dive near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

Air bags can be seen near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

Air bags can be seen near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

South Korean coast guard and navy divers prepare to dive near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

Air bags can be seen near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

South Korean coast guard and navy divers prepare to dive near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)

South Korean coast guard and navy divers prepare to dive near the capsized ferry in Jindo on April 18, 2014. South Korean coast guard and navy divers will seek to enter into the hull of the sunken South Korean passenger ferry for three hours late Friday after failing to make their way into passenger cabins earlier. (Xinhua/Song Cheng Feng)