Posted 06 December 2009 - 11:18 PM
Yes, some areas are not possible to completely clear once the biomass reaches them. The anti-biomass bases have a limited range making it particullary diffucult to clear areas were bases are furthest appart. The nodes only initiate and boost the growth of the biomass within a small radius, but it can perfectly keep on growing without nodes. I do believe it's possible to clear the biomass completely, but you need to be lucky on the placement of the nodes, discovering the first node and getting a mission on the biomass early enough to act in time.
There's always some dirt to dig out