Packed as tightly as possible, meaning a solid block of bodies, and going off the average volume of a person, 900,000 people would take the space of approx—156 yards by 156 yards by 3 yards deep, or 73,008 cubic yards.
In the context of a football field, with those dimensions (including end zones), the depth would have to be almost 12 yards or 36 feet.
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