"Sets a mine that will explode when enemy passes over it"
Land mine is defensive structure which can only be activated by infected passing over it. It deals 500 damage on explosion in 1-tile radius, which is enough to kill most enemies, except Chubbies, Behemoths and Giants. It can be configured to explode 0, 1, 2 or 3 seconds after triggering. Land mines will damage friendly units and buildings within explosion radius, but will not affect building defensive barriers and do not damage or trigger other mines.