diff --git a/scenes/game_elements/characters/enemies/guard/components/guard.gd b/scenes/game_elements/characters/enemies/guard/components/guard.gd
index 8a9a67e56..a602ac6a6 100644
--- a/scenes/game_elements/characters/enemies/guard/components/guard.gd
+++ b/scenes/game_elements/characters/enemies/guard/components/guard.gd
@@ -466,6 +466,8 @@ func _set_alert_other_sound_stream(new_value: AudioStream) -> void:
 
 
 func _on_instant_detection_area_body_entered(body: Node2D) -> void:
+	if _is_sight_to_point_blocked(body.global_position):
+		return
 	state = State.ALERTED
 	player_detected.emit(body)
 
diff --git a/scenes/game_elements/props/door/components/door.gd b/scenes/game_elements/props/door/components/door.gd
index 20af8aebe..008199917 100644
--- a/scenes/game_elements/props/door/components/door.gd
+++ b/scenes/game_elements/props/door/components/door.gd
@@ -40,6 +40,8 @@ func update_opened_state() -> void:
 
 	%ColliderWhenClosed.set_collision_layer_value(Enums.CollisionLayers.WALLS, not opened)
 	%ColliderWhenClosed.set_collision_mask_value(Enums.CollisionLayers.PLAYERS, not opened)
+	%SightOcclussion.set_collision_layer_value(Enums.CollisionLayers.SIGHT_OCCLUDERS, not opened)
+	%LightOccluder2D.visible = not opened
 
 
 func update_door_flip() -> void:
diff --git a/scenes/game_elements/props/door/horizontal_door.tscn b/scenes/game_elements/props/door/horizontal_door.tscn
index b44f4eaf0..fc85462aa 100644
--- a/scenes/game_elements/props/door/horizontal_door.tscn
+++ b/scenes/game_elements/props/door/horizontal_door.tscn
@@ -6,12 +6,22 @@
 [ext_resource type="AudioStream" uid="uid://wyrvtep877iy" path="res://assets/third_party/sounds/characters/enemies/throwing_enemy/Door.ogg" id="4_0hwet"]
 [ext_resource type="AudioStream" uid="uid://erxulumcdtuu" path="res://assets/third_party/sounds/characters/enemies/throwing_enemy/Ring.ogg" id="5_qouav"]
 
+[sub_resource type="OccluderPolygon2D" id="OccluderPolygon2D_ty0te"]
+polygon = PackedVector2Array(7, 9, 7, -138, -6, -138, -6, 9)
+
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_t3aaa"]
 size = Vector2(13, 76.25)
 
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_qda76"]
+size = Vector2(19, 133.375)
+
 [node name="HorizontalDoor" type="Node2D" unique_id=1860367584]
 script = ExtResource("1_apinb")
 
+[node name="LightOccluder2D" type="LightOccluder2D" parent="." unique_id=1053118773]
+unique_name_in_owner = true
+occluder = SubResource("OccluderPolygon2D_ty0te")
+
 [node name="DoorClosed" type="Sprite2D" parent="." unique_id=47488445]
 unique_name_in_owner = true
 position = Vector2(26, -63)
@@ -31,6 +41,16 @@ collision_layer = 16
 position = Vector2(0.5, -37.125)
 shape = SubResource("RectangleShape2D_t3aaa")
 
+[node name="SightOcclussion" type="StaticBody2D" parent="." unique_id=729311558]
+unique_name_in_owner = true
+collision_layer = 8
+collision_mask = 0
+
+[node name="ShapeWhenClosed" type="CollisionShape2D" parent="SightOcclussion" unique_id=1123213291]
+position = Vector2(0.5, -63.3125)
+shape = SubResource("RectangleShape2D_qda76")
+debug_color = Color(0.972549, 0, 0.44313726, 0)
+
 [node name="DoorOpenSound" type="AudioStreamPlayer2D" parent="." unique_id=1659028188]
 unique_name_in_owner = true
 stream = ExtResource("4_0hwet")
diff --git a/scenes/game_elements/props/door/vertical_door.tscn b/scenes/game_elements/props/door/vertical_door.tscn
index e439b372e..168063d9c 100644
--- a/scenes/game_elements/props/door/vertical_door.tscn
+++ b/scenes/game_elements/props/door/vertical_door.tscn
@@ -6,12 +6,22 @@
 [ext_resource type="AudioStream" uid="uid://wyrvtep877iy" path="res://assets/third_party/sounds/characters/enemies/throwing_enemy/Door.ogg" id="4_wl1pt"]
 [ext_resource type="AudioStream" uid="uid://erxulumcdtuu" path="res://assets/third_party/sounds/characters/enemies/throwing_enemy/Ring.ogg" id="5_20262"]
 
+[sub_resource type="OccluderPolygon2D" id="OccluderPolygon2D_ty0te"]
+polygon = PackedVector2Array(33, -65, 26, -73, 18, -76, -18, -76, -27, -73, -33, -65, -30, -65, -18, -72, 18, -72, 30, -65)
+
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_t3aaa"]
 size = Vector2(57.5, 25)
 
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_mqtua"]
+size = Vector2(68, 81)
+
 [node name="VerticalDoor" type="Node2D" unique_id=1860367584]
 script = ExtResource("1_t3aaa")
 
+[node name="LightOccluder2D" type="LightOccluder2D" parent="." unique_id=366675999]
+unique_name_in_owner = true
+occluder = SubResource("OccluderPolygon2D_ty0te")
+
 [node name="DoorClosed" type="Sprite2D" parent="." unique_id=47488445]
 unique_name_in_owner = true
 position = Vector2(0, -32)
@@ -31,6 +41,16 @@ collision_layer = 16
 position = Vector2(0.25, -12.5)
 shape = SubResource("RectangleShape2D_t3aaa")
 
+[node name="SightOcclussion" type="StaticBody2D" parent="." unique_id=2115023129]
+unique_name_in_owner = true
+collision_layer = 8
+collision_mask = 0
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="SightOcclussion" unique_id=1355802857]
+position = Vector2(0, -37.5)
+shape = SubResource("RectangleShape2D_mqtua")
+debug_color = Color(0.972549, 0, 0.44313726, 0)
+
 [node name="DoorOpenSound" type="AudioStreamPlayer2D" parent="." unique_id=1659028188]
 unique_name_in_owner = true
 stream = ExtResource("4_wl1pt")