diff --git a/parsers/survex.py b/parsers/survex.py
index 8fc7e24..bd05010 100644
--- a/parsers/survex.py
+++ b/parsers/survex.py
@@ -1447,11 +1447,12 @@ def MakeSurvexFileRoot():
     """Returns a file_object.path = SURVEX_TOPNAME associated with directory_object.path = SURVEX_DATA
     """
     # find a cave, any cave..
-    c = Cave.objects.all()
+    caves = Cave.objects.all()
+    smk = caves.filter(kataster_number="000")
     
     fileroot = SurvexFile(path=settings.SURVEX_TOPNAME, cave=None)
     fileroot.save()
-    directoryroot = SurvexDirectory(path=settings.SURVEX_DATA, cave=c[0], primarysurvexfile=fileroot)
+    directoryroot = SurvexDirectory(path=settings.SURVEX_DATA, cave=smk, primarysurvexfile=fileroot)
     # MariaDB doesn't like this hack. Complains about non-null cave_id EVEN THOUGH our model file says this is OK:
     # cave = models.ForeignKey('Cave', blank=True, null=True,on_delete=models.SET_NULL)
     directoryroot.save()