On a side note,

 

instead the directional wheel,

 

certainly rotational protruding rod/tube

that lifts the entire machine off the ground

to change its direction, then descending down

again = better.

 

wait... wouldn't work in a slope/hill....

 

sigh.

 

well can be both. directional wheel

and rotational protruding/retracting rod...

 

but nevermind, just seems like

landmine removers are costly,

cannot reach narrower places...?

 

Programmable roomba landmine remover....