3) Roughly once per every 10 mining actions, according to recent notes, you will drop the rock level at the point where you are mining by 1 dirt. This does not appear to be a cumulative chance. Sometimes you will drop the rock level very quickly for a short spurt, other times you might mine 25 times and not drop the level. In other words, many failures in a row does not make future success more likely.
4) Surface mining is reported to allow you Attempting to lower surface rock below the level ceiling of existing tunnels undergrounda mine below results in the message "The rock sounds hollow, you will need to tunnel to continue". It would be good to get some additional confirmation of At thispoint, though I am rather certain that at one of my personal you cannot lower the surface lowering locations, I did precisely that, lowering the level of rock to a point below where it should have broken through into a tunnel. Remember Wurm is not truly 3Dany further.
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