no way this works, not in typical soil - and probably not even in sand. First of all, much too hard to be done by hand, so then you need a big piece of hydrauli

no way this works, not in typical soil - and probably not even in sand. First of all, much too hard to be done by hand, so then you need a big piece of hydraulic equipment, which I am quite sure could handle the force necessary (think post haul auger that telephone companies use). But that coffin is not going to be strong enough to withstand those forces - and who wants to watch that think 'snap' when you are trying to screw it into the ground and you end up snapping gramma or grandpa in half...sorry, but no thanks.