I noticed that cliff explosives seem to have their effect expanded when trying to blow up a straight cliff that has pipes built adjacent to it. All cliffs that are adjacent to the straight pipes will be destroyed until there is a curve.
Attached is a video illustrating the occurence. You can also see it on the Reddit post I did : https://www.reddit.com/r/factorio/comments/1osn4er/pipes_seem_to_extend_the_effect_of_cliff/
I don't believe that is the intended behaviour since it seems a bit exploitable.
I only tested it on Vulcanus since that's where I noticed it earlier and I am kind of stranded here for now. So I don't think I can try it on Nauvis, sorry!
Hope it helps, keep up the good job!

