Image of 8 from The unstoppable back-packable 6x6 Spyrobot

March 22, 2008 The Macroswiss 4WD Spyrobot is virtually unstoppable – it can swim and traverse almost any terrain with its 4WD flapper wheels. Now work has begun on a 6WD model which will carry four times its weight - an arsenal of sensing apparatus and increasingly, munitions, yet still remain back-packable for squad level usage.