diff --git a/mods/cnc/rules/defaults.yaml b/mods/cnc/rules/defaults.yaml
index 91240d58a8..8c3f55a1ea 100644
--- a/mods/cnc/rules/defaults.yaml
+++ b/mods/cnc/rules/defaults.yaml
@@ -317,12 +317,14 @@
 	Guardable:
 		Range: 3
 	BodyOrientation:
+	FrozenUnderFog:
 
 ^CivBuilding:
 	Inherits: ^Building
 	-DeadBuildingState:
 	-Buildable:
 	-GivesBuildableArea:
+	-FrozenUnderFog:
 	Health:
 		HP: 400
 	Armor: 
diff --git a/mods/cnc/rules/system.yaml b/mods/cnc/rules/system.yaml
index f3dc876469..0da2d447c6 100644
--- a/mods/cnc/rules/system.yaml
+++ b/mods/cnc/rules/system.yaml
@@ -273,6 +273,7 @@ World:
 	ProductionQueueFromSelection:
 		ProductionTabsWidget: PRODUCTION_TABS
 	BibLayer:
+		FrozenUnderFog: true
 	DomainIndex:
 	ResourceLayer:
 	ResourceClaimLayer:
diff --git a/mods/ra/rules/defaults.yaml b/mods/ra/rules/defaults.yaml
index e5259b6b02..d4d49b2504 100644
--- a/mods/ra/rules/defaults.yaml
+++ b/mods/ra/rules/defaults.yaml
@@ -222,7 +222,6 @@
 		ActorTypes: e1,e1,e1,e1,e1,e1,e1,e1,e1,e1,e1,e1,e1,e1,e1,c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,e6,e6,e6,e6,e6
 	MustBeDestroyed:
 	GivesExperience:
-#	FrozenUnderFog:
 	CaptureNotification:
 	EditorAppearance:
 		RelativeToTopLeft: yes
@@ -237,6 +236,7 @@
 	Guardable:
 		Range: 3
 	BodyOrientation:
+	FrozenUnderFog:
 
 ^Wall:
 	AppearsOnRadar:
diff --git a/mods/ra/rules/system.yaml b/mods/ra/rules/system.yaml
index af115dc9e3..bcb15b969f 100644
--- a/mods/ra/rules/system.yaml
+++ b/mods/ra/rules/system.yaml
@@ -604,6 +604,7 @@ World:
 		Name: Soviet
 		Race: soviet
 	BibLayer:
+		FrozenUnderFog: true
 	DomainIndex:
 	ResourceLayer:
 	ResourceClaimLayer: