I edited a section of landscape, cut out an area for a bunker and placed it. All looks nice in geck but when i load it into NV theirs a ugly wall of pixlated landscape. Using Noclip i discovered this blareing wall of pixles is some kind of sub surface landscape below all the landscape. I cut out a hill so its the hills sub surface mesh or whatever that still remains. How do i remove/edit it to conform to my changes? I tried cell option for Hand Changed, but it dose nothing.
Picks below show what i mean.
How do i edit this subsurface mesh?
BTW: I can walk though the wall just fine, along with my companions on the walk mesh. Everything rendered properly behind it, and look out from behind the wall everything looks normal.
This is inside GECk

Inside Game