This is seriously freaky. I mean, I know cats have "nine lives" and all, but this cat was struck by a car, pronounced dead by the owner and neighbor, and then buried. Then, he dug himself out....and showed up at the neighbor's door looking for food.
Miracle, zombie, or just plain cat-weirdness? I'm not even sure.
All I can say is make sure that things are not alive before you bury them in the ground.....nobody wants a buried alive situation (even the poor kitty).