Accidental digging upgrade?

Dam it's annoying.

Happened to me too, I personally upgraded it to level 5 for the tech achievement since it was already level 3 and the rest were 2 :P just an idea to use accidents for the better

Yeah but it'll still benefit you so not really much to get upset about unless your real low on money or something.

I manage to accidently upgrade it all the time, it's a nuisance