Rescue helicopters fly over a sinking South Korean passenger ferry that was carrying more than 450 passengers, mostly high school students, Wednesday, April 16, 2014, off South Korea's southern coast. Hundreds of people are missing despite a frantic, hours-long rescue by dozens of ships and helicopters. At least four people were confirmed dead and 55 injured. (AP Photo/Yonhap)

Photos: South Korea ferry disaster

A ferry carrying 462 people, mostly high school students on an overnight trip to a tourist island, sank off South Korea’s southern coast.