had same problem.
it is mean that you have something undestroyed like enemies wall or oil dericks.
Simple method to check it without scouring whole map is to open this file
c:\warzone 2100 3.1\savegames\camaign\
YOUR SAVE\
struct
open it with notepad go to the bottom and look something like this
[structure_0000000039]
id=162761
player=1
- player 1 means your enemy
name=WallTower02
type of structure you are loking for
position=3392, 14272, 255 YOU NEED THIS ONE
rotation=0, 0, 0
health=520
born=6731910
visible\1=255
resistance=150
weapons=1
parts\weapon\1=Cannon1Mk1
ammo\0=0
lastFired\0=0
shotsFired\0=0
rotation\0=0, 0, 0
currentBuildPts=400
3392 first number is x
14272 is y
255 is z
0,0 - is top left part of the map
15000,15000 is bottom right
for example position=3392, 14272, 255 is simething like here
