ZIL-4904, a Screw Vehicle ?!

You must be wondering, what the hell is a "Screw" vehicle? Well, instead of boring you with tons of boring technical terms ill just show you a pic.

This is a prototype created in Russia (where else ... ) and its supposed to be able to walk on mud and snow real easy, but it was not put to fabrication because they didnt find any thing usefull to do with. What did they expect making a car with screws for wheels?!