Speaking of doing the math... I was curious about the volume of ashes created after one human body is cremated. It was an easy internet search, and the easiest data point I found was one average human packs into a box 8 inches by 5 inches by 5 inches. I then multiplied that by 6 million people. Data is below. Note - I understand that the sizes/weights of prisoners of war were probably much less than what the website used as average (175lbs) but even if you halve these numbers it doesn't change the fact that the ash piles would be impossible to hide.

Average size of 1 Person: cremated ashes (in a box) = 8x5x5 inches

Average size of 6M People: cremated ashes (in a box) = 48Mx30Mx30M inches

Inches in 1 mile = 63,360

Average size of 6M People: cremated ashes (in a box) =

757.58 miles x 473.48 miles x 473.48 miles

Edited to add a link: Link.

Speaking of doing the math... I was curious about the volume of ashes created after one human body is cremated. It was an easy internet search, and the easiest data point I found was one average human packs into a box 8 inches by 5 inches by 5 inches. I then multiplied that by 6 million people. Data is below. Note - I understand that the sizes/weights of prisoners of war were probably much less than what the website used as average (175lbs) but even if you halve these numbers it doesn't change the fact that the ash piles would be impossible to hide.

Average size of 1 Person: cremated ashes (in a box) = 8x5x5 inches

Average size of 6M People: cremated ashes (in a box) = 48Mx30Mx30M inches

Inches in 1 mile = 63,360

Average size of 6M People: cremated ashes (in a box) =

757.58 miles x 473.48 miles x 473.48 miles