South Korea's government said on Monday it will extend the shutdown of Muan International Airport by a week to Jan. 14, citing the ongoing investigation into the crash of a Jeju Air jet that killed 179 passengers on board.

South Korean officials are struggling to determine what caused a deadly plane crash that killed nearly 180 people on board, with the nation saddened, shocked and ashamed over the country’s worst aviation disaster in decades.

The flight, operated by Jeju Air, was landing when it went off the runway in Muan, in the country’s southwest. Only two people survived the crash.

A survivor of South Korea's deadliest airline disaster arrives at hospital:: Seoul, South Korea::Jeju Air flight 7C2216, arriving from the Thai capital Bangkok with 175 passengers and six crew on board,

Investigators from the NTSB and Boeing were expected to join the investigation into South Korea's deadliest air crash.

In his own words, a restaurant owner described recording videos of the Jeju Air plane crash as it happened. “Every time I closed my eyes, I kept seeing afterimages of the blast.”

Two crew members may have survived the Jeju Air plane crash in South Korea thanks to sitting backwards with a harness on in the safest part of the cabin, according to aviation experts.

South Korea’s transport minister is resigning because he feels “heavy responsibility” for the Jeju Air crash that killed 179 people last month. A Jeju Air aircraft carrying 181 passengers and crew crashed at the Muan international airport on 29 December in what was the country’s worst air disaster.