The Culling, also known as Kane's Population Reduction Plan, was an event spearheaded by the Council where 320 Arkers willingly sacrificed themselves so the rest of the Ark would have more time to repair life support. After the Delinquents were able to contact the Ark and let everyone know the Earth was able to support life, the families of those culled became upset with what they now perceived as an unnecessary sacrifice. This contributed to the Unity Day mutiny