"The Bagger 288 can dig a 100-foot-deep hole that's the size of a football field in a day."

Isn't a football field measured in yards? 3ft=1yard right? Did somebody make a mistake or did I miss something? And that's not that impressive considering its size as a machine... if the hole was as big as a football field and was 3 football fields in depth... for a day's work that's something to write about...