By Esther Tanquintic-Misa | May 7, 2014 11:56 AM EST

South Korea Ferry Disaster: Four More Vessel Officials Arrested; Retrieval Operations Continue Despite Death of Civilian Diver; Cargo Overload Cause of Disaster (PHOTOS)

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A boy ties a yellow ribbon dedicated to missing and dead passengers of the sunken passenger ship Sewol on a pillar at Yellow Ribbon's Garden set up at Seoul City Hall Plaza May 5, 2014. A culture of cosy personal ties that can blur the lines between businesses and those regulating them, of profit over safety, and soft courts is in focus as South Korea demands answers over the sinking of a ferry with the loss of more than 300 lives, mainly high school students. REUTERS/Jung Hwe-sung/News1 (REUTERS/Jung Hwe-sung/News1/)