1 of 3
Ahn Young-joon, Pool, Associated Press
Judges sit to preside over verdicts for the sunken South Korean ferry Sewol's crew members who are charged with negligence and abandonment of passengers in the disaster at Gwangju High Court in Gwangju, South Korea, Tuesday, April 28, 2015. The South Korean appellate court on Tuesday handed down a sentence of life in prison to the captain of a ferry that sank last year, killing more than 300 people. The sentencing is harsher than a November verdict by a district court that sentenced Lee Joon-seok to 36 years in prison for negligence and abandoning passengers in need.

SEOUL, South Korea — The South Korean ferry captain responsible for last year's disaster that killed more than 300 people, mostly school children, was given an increased sentence of life in prison Tuesday by an appellate court that convicted him of homicide.

A district court in November had sentenced Lee Joon-seok to 36 years in prison for negligence and abandoning passengers in need but acquitted him of homicide. Victims' relatives criticized the verdict at the time, saying it was too lenient. Prosecutors earlier had demanded the death penalty for Lee.

Lee's sentence was increased because the Gwangju High Court additionally convicted him on the homicide charges while upholding most of other charges that led to his November conviction, according to a court statement.

The appellate court sentenced 14 other navigation crew members to 18 months to 12 years in prison, the statement said. In November they had received sentences of five to 30 years in prison.

The court said it decided on Lee's homicide conviction because he fled the ship without making any evacuation order though he, as a captain, is required by law to take some measures to rescue his passengers.

Lee's behavior was "homicide by willful negligence," the court judged. "For whatever excuses, it's difficult to forgive Lee Joon-seok's action that caused a big tragedy," the court statement cited the verdict as saying.

Lee and the 14 crew members have been the subject of fierce public anger because they were among the first people rescued from the ship when it began badly listing on the day of the sinking in April last year. Most of the victims were teenagers who were en route to a southern island for a school trip.

Lee has said he issued an evacuation order, but the court statement said two of the 14 crew members acknowledged that there was no evacuation order. Many student survivors have said they were repeatedly ordered over a loudspeaker to stay on the sinking ship and that they didn't remember there any evacuation orders made by crewmembers before they helped each other to flee the ship.

Court spokesman Jeon Ilho said both prosecutors and the crew members have one week to appeal the verdicts.

A year after sinking, 295 bodies have been retrieved but nine others are missing. There is still lingering public criticism against the government over its handling of the sinking, the country's deadliest maritime disaster in decades. Violence occurred during a Seoul rally led by relatives and their supporters earlier this month, leaving dozens of people injured.

Last week, South Korea formally announced it would salvage the ship from the ocean floor off the country's southwest coast. Relatives of the victims hope that might locate the missing, including four students, and help reveal more details about the sinking. Some experts are skeptical about those wishes and remain opposed to spending taxpayer's money to lift the civilian vessel.

Officials say the salvage job is estimated to cost $91 million to $137 million and take 12 to 18 months.

Authorities blame excessive cargo, improper storage, botched negligence and other negligence for the sinking, and have arrested about 140 people. Critics say higher-level officials haven't been accountable.