Land mines are often used to secure some area or to stop hostile soldiers. The standard explosive way of their use kills or harms people. It is not necessary anymore. It is long ago observed that vibrated sand behaves like fluid. And that is the essence of my innovation - an army can make vibrational mine fields. Enemy forces can sink in sand making them useless in battle but without killing people.

How it works:
* The source of energy will be highly compressed CO2.
* The central turbine powered by CO2 charge rotates unbalanced weights - that causes vibrations.

Construction is simple and can be cheaply and mass-produced.