A lot of people are pointing out flaws like the difficulty in screwing it in - although the original patent includes the use of a post-hole digger as a pilot hole. Nobody has mentioned the fact that - in the video at least - the deceased's head would be in the above-ground portion. Entering a cemetery would expose you to a large field of head-boxes. The idea of this on a hot day also concerns me: hermetically sealed is one thing, but steam pressure is pretty intense.

I propose an alteration: the unit be built with a large slot in the top, instead of the current capstan device. Then you could use a standard gravestone as a screwdriver...