diff --git a/src/main/java/climateControl/ClimateControl.java b/src/main/java/climateControl/ClimateControl.java
index fb11893..ca79a07 100644
--- a/src/main/java/climateControl/ClimateControl.java
+++ b/src/main/java/climateControl/ClimateControl.java
@@ -34,6 +34,7 @@
 import climateControl.utils.PropertyManager;
 import climateControl.utils.TaggedConfigManager;
 import climateControl.utils.Zeno410Logger;
+import cpw.mods.fml.common.Loader;
 import cpw.mods.fml.common.Mod;
 import cpw.mods.fml.common.Mod.EventHandler;
 import cpw.mods.fml.common.event.FMLInitializationEvent;
@@ -72,6 +73,8 @@ public class ClimateControl {
 
     private ExternalBiomePackage externalBiomesPackage;
 
+    public static boolean isBoPLoaded;
+
     @EventHandler
     public void preInit(FMLPreInitializationEvent event) {
         addonConfigManager = new TaggedConfigManager("climatecontrol.cfg", "ClimateControl");
@@ -91,7 +94,6 @@ public void preInit(FMLPreInitializationEvent event) {
         config.load();
         // if (this.rescueOldCCMode) defaultSettings.set(config);
         // this.settings = defaultSettings.clone();
-
         setupRegistry();
         newSettings.readFrom(config);
 
@@ -110,6 +112,7 @@ public void preInit(FMLPreInitializationEvent event) {
             event.getSuggestedConfigurationFile());
         config.save();
 
+        isBoPLoaded = Loader.isModLoaded("BiomesOPlenty");
     }
 
     @EventHandler
diff --git a/src/main/java/climateControl/api/ClimateControlSettings.java b/src/main/java/climateControl/api/ClimateControlSettings.java
index a054eee..9bca6b1 100644
--- a/src/main/java/climateControl/api/ClimateControlSettings.java
+++ b/src/main/java/climateControl/api/ClimateControlSettings.java
@@ -279,7 +279,7 @@ public void accept(Boolean accepted) {
         .booleanSetting(interveneInHighlandsName, false, "impose Climate Control generation on Highlands world types");
 
     public final Mutable<Boolean> noBoPSubBiomes = climateControlCategory
-        .booleanSetting(noBoPSubBiomesName, true, "suppress Bop sub-biome generation");
+        .booleanSetting(noBoPSubBiomesName, false, "suppress Bop sub-biome generation");
 
     public final Mutable<Boolean> interveneInBOPWorlds = climateControlCategory.booleanSetting(
         interveneInBOPName,
@@ -295,7 +295,7 @@ public void accept(Boolean accepted) {
         .booleanSetting(forceStartContinentName, true, "force small continent near origin");
 
     public final boolean doBoPSubBiomes() {
-        return noBoPSubBiomes.value() == false;
+        return !noBoPSubBiomes.value();
     }
 
     public final Mutable<String> externalBiomeNames = climateControlCategory.stringSetting(
diff --git a/src/main/java/climateControl/biomeSettings/BoPSubBiomeReplacer.java b/src/main/java/climateControl/biomeSettings/BoPSubBiomeReplacer.java
index 35ad88c..3c113fa 100644
--- a/src/main/java/climateControl/biomeSettings/BoPSubBiomeReplacer.java
+++ b/src/main/java/climateControl/biomeSettings/BoPSubBiomeReplacer.java
@@ -32,6 +32,11 @@ public BoPSubBiomeReplacer(IntRandomizer randomizer) {
     public int replacement(int currentBiomeId, IntRandomizer randomizer, int x, int z) {
 
         List<BiomeEntry> currentSubBiomes = BOPBiomeManager.overworldSubBiomes[currentBiomeId];
+
+        if (currentBiomeId == BiomeGenBase.deepOcean.biomeID) {
+            currentSubBiomes = null; // prevents BoP sub-biomes generating in deep ocean
+        }
+
         BOPSubBiome selectedSubBiome = currentSubBiomes != null
             ? (BOPSubBiome) currentSubBiomes.get(randomizer.nextInt(currentSubBiomes.size())).biome
             : null;
diff --git a/src/main/java/climateControl/customGenLayer/GenLayerSubBiome.java b/src/main/java/climateControl/customGenLayer/GenLayerSubBiome.java
index 9c68b59..08263c9 100644
--- a/src/main/java/climateControl/customGenLayer/GenLayerSubBiome.java
+++ b/src/main/java/climateControl/customGenLayer/GenLayerSubBiome.java
@@ -11,6 +11,9 @@
 import net.minecraft.world.gen.layer.GenLayer;
 import net.minecraft.world.gen.layer.IntCache;
 
+import climateControl.ClimateControl;
+import climateControl.biomeSettings.BiomeReplacer;
+import climateControl.biomeSettings.BoPSubBiomeReplacer;
 import climateControl.genLayerPack.GenLayerPack;
 import climateControl.generator.BiomeSwapper;
 import climateControl.generator.SubBiomeChooser;
@@ -24,6 +27,8 @@ public class GenLayerSubBiome extends GenLayerPack {
     private final SubBiomeChooser subBiomeChooser;
     private final BiomeSwapper mBiomes;
 
+    private BiomeReplacer BoPSubBiomeReplacer;
+
     private IntRandomizer randomCallback = new IntRandomizer() {
 
         public int nextInt(int maximum) {
@@ -39,6 +44,9 @@ public GenLayerSubBiome(long p_i45479_1_, GenLayer biomes, GenLayer rivers, SubB
         this.subBiomeChooser = subBiomeChooser;
         this.mBiomes = mBiomes;
         this.initChunkSeed(0, 0);
+        if (ClimateControl.isBoPLoaded && doBoP) {
+            BoPSubBiomeReplacer = new BoPSubBiomeReplacer(randomCallback);
+        }
     }
 
     /**
@@ -110,6 +118,12 @@ public int[] getInts(int par1, int par2, int par3, int par4) {
                         }
                     }
                 }
+                // now the GenLayerHills stuff is done so run BoP subbiome replacements if it's on
+                if (this.BoPSubBiomeReplacer != null) {
+                    this.initChunkSeed(j1 + par1, i1 + par2);
+                    aint2[j1 + i1 * par3] = BoPSubBiomeReplacer
+                        .replacement(aint2[j1 + i1 * par3], randomCallback, j1 + par1, i1 + par2);
+                }
             }
         }