Can you and if not can HPS look at changing it?

[Engelbrekt]

3) The Probablity of Rubble being cleared - agian from the manual:
> "The probability that the rubble will be cleared in the hex is half the Digging-In Parameter Data value per turn."

I know it has been up before and what the manual says, but I doubt this to be true. In several years of playing I have never successfully cleared rubble or seen or heard of anyone else doing it.

Are there any players who can verify that the manual is correct or who feel like me, that rubble is easily achieved and then permanent?