move cursor somewhere, press R.
younwill see a white small ball there, being the robot, with 8 arrows next to it, one in eahc direction. click one of the arrows.
bot will move in that direction and dig for a set number of tiles (like 50 tiles or soemthing?) before disappearing.
so same result if you dug straight up down or such for a while with your pickaxe.
honestly not worht the money, it aint as you might think some passive thing you can buy and it will forevr mine stuff.
more like "remove 50 tiles to the right of your cursor" basically.
useless.
and grenades honestly is also only good at the start, until you get your literally first "upgrade" and the pickaxe become obsolete until the end of the game.