I estimate the corpses of all 6 billion human beings contain less cubic feet of space than a hole 1 mile X 1 mile X 1 mile.
But then again, it is pretty late for me. I could be wrong.
BTW, why ask that question?
It’s a question an old high-school teacher of mine once posed to show just how much people over-estimate man’s place on Earth.
You are correct in your estimate. A hole 1 mile square and less than 1/2 mile deep would be a grave large enough to dump all six billion people.
It’s hard to imagine how microscopic a speck that is.
Most people are math-challenged and give a knee-jerk response like “a hole the size of Texas !”