diff --git a/src/common/technologies/MTG_naval.txt b/src/common/technologies/MTG_naval.txt
index b01b481..afe7d23 100755
--- a/src/common/technologies/MTG_naval.txt
+++ b/src/common/technologies/MTG_naval.txt
@@ -1540,6 +1540,12 @@ technologies = {
 	}
 	nuclear_engine_research = {
 		research_cost = 1.25
+		is_special_project_tech = yes
+		allow = {
+			ROOT = {
+				is_special_project_completed = sp:sp_nuclear_reactor
+			}
+		}
 		enable_equipment_modules = {
 			cruiser_ship_engine_nuclear
 			carrier_ship_engine_nuclear
@@ -4504,7 +4510,7 @@ technologies = {
 	}
 
 	full_armored_carrier = {
-		research_cost = 1.25
+		research_cost = 0.7
 		start_year = 1944
 
 		carrier = {
@@ -4545,7 +4551,7 @@ technologies = {
 	}
 
 	carrier_angled_deck = {
-		research_cost = 0.7
+		research_cost = 0.5
 		start_year = 1944
 
 		enable_equipment_modules = {
@@ -5290,6 +5296,12 @@ technologies = {
 	}
 
 	sub_nuclear_engine = {
+		is_special_project_tech = yes
+		allow = {
+			ROOT = {
+				is_special_project_completed = sp:sp_nuclear_reactor
+			}
+		}
 		enable_equipment_modules = {
 			sub_ship_engine_nuclear
 		}
@@ -5297,9 +5309,6 @@ technologies = {
 		start_year = 1949
 		research_cost = 1.25
 
-		dependencies = {
-			nuclear_reactor = 1
-		}
 		folder = {
 			name = mtgnavalfolder
 			position = { x = -2 y = 23 }
diff --git a/src/common/technologies/MTG_naval_Support.txt b/src/common/technologies/MTG_naval_Support.txt
index 3cab2dd..e1f0a9d 100755
--- a/src/common/technologies/MTG_naval_Support.txt
+++ b/src/common/technologies/MTG_naval_Support.txt
@@ -3556,7 +3556,7 @@ technologies = {
 		xp_research_type = navy
 		xp_boost_cost = 75
 		xp_research_bonus = 1.75
-		research_cost = 2.0
+		research_cost = 0.75
 		start_year = 1938
 		folder = {
 			name = mtgnavalsupportfolder
@@ -3587,7 +3587,7 @@ technologies = {
 		xp_research_type = navy
 		xp_boost_cost = 75
 		xp_research_bonus = 1.5
-		research_cost = 2.5
+		research_cost = 1
 		start_year = 1943
 		folder = {
 			name = mtgnavalsupportfolder