Check this out – a robot that is capable of burrowing itself, as though it were some sort of electronic zergling, or for some others with a more active imagination, this might end up as a humanized version of the Decepticon known as Scorponok (according to the Transformers movie that was released in 2007, of course, burrowing itself and all). We have absolutely no idea why there is a need to roll out a robot that is able to bury itself, but chances are, it might see far more use in military operations at a desert or in more remote areas compared to just popping up at random all over your garden like digletts just to scare folks.
Here is a description that we pulled off the Internet concerning the self-burying robot, “One use case is for this robot to drive or be air-dropped to a location close to a target, bury itself to be hidden, perform video surveillance, and send that video back to an operator.” Needless to say, plenty of work still needs to be done in order to perfect such a robot, but at least this is a start. Hopefully it will be quiet while it is “at work”, if you know what I mean. After all, I’m sure the military appreciates stealth, too.