A year ago Thursday, the ferry Sewol sank off the southwestern coast of South Korea, killing more than 300 people in one of the country's deadliest disasters.

Here, by the numbers, is a look at the April 16, 2014, sinking:

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THE VICTIMS:

People aboard the ship: 476

Survivors: 172

Passengers whose bodies have been recovered: 295

Passengers still missing: 9

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THE RESCUE:

Number of coast guard ships mobilized during the first hour after initial report of the accident: 1

Number of helicopters mobilized during the first hour after initial report of the accident: 3

Days spent on search and rescue operations: 210

Divers who died during the search: 2

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THE SCHOOL:

Size of Danwon High School Class of 2016 at time of disaster: 338

Number of those students on board the ferry: 325

Students who died: 250

Teachers on board: 14

Teachers who survived the sinking: 3, though one killed himself soon after

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THE REACTION:

Number of people who have visited mourning sites to pay respects to victims: 2.3 million

Number of people arrested following the sinking, including crew members, ferry company officials and shipping industry regulators: 139

Estimated cost of raising the submerged ferry from the water: between $91 million and $137 million

Time needed to raise the ferry from the water: between 1 and 1½ years

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Sources: The Ministry of Public Safety and Security, the Ministry of Oceans and Fisheries, the Supreme Prosecutors' Office, a government task force on helping victims with funerals, Gyeonggi Provincial Office of Education and Danwon High School.