Each week, e-grocer FreshDirect delivers 100,000 grocery boxes direct to customers' doors. It all happens from its Bronx warehouse, which is the size of 11 football fields. Using an advanced AI system, temperature controls, nine miles of conveyor belt, and a fleet of delivery trucks, the company is able to cut out three steps in the normal grocery-store supply chain. Business Insider visited the warehouse to see how the company moves 3 million grocery items a week in the face of unprecedented pandemic demand.