The idea seems like a winner but a big flaw is that you need to dig a pilot hole. If that's the case then just dig the hole a bit larger and burry a regular cof

The idea seems like a winner but a big flaw is that you need to dig a pilot hole. If that's the case then just dig the hole a bit larger and burry a regular coffin standing up. Or, for that matter, a tightly wrapped body can just be placed standing up. If somehow you could skip the pilot hole then it would be a great solution. I don't know enough to give an educated opinion but the screw in solution is certainly a creative one. I suspect that it has other uses.