diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e8b77bd6..42598656e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,6 @@
 ## [Unreleased](https://github.com/LostArtefacts/TR-Rando/compare/V1.8.2...master) - xxxx-xx-xx
+- fixed incorrect items sometimes being allocated as secret rewards in Thames Wharf (#597)
+- fixed an inaccessible secret in Offshore Rig when the main area is drained (#597)
 
 ## [V1.8.2](https://github.com/LostArtefacts/TR-Rando/compare/V1.8.1...V1.8.2) - 2024-01-14
 - fixed some pickups appearing in unreachable locations in TR2 (#591)
diff --git a/TRRandomizerCore/Randomizers/TR3/TR3ItemRandomizer.cs b/TRRandomizerCore/Randomizers/TR3/TR3ItemRandomizer.cs
index bb97fbb90..8f2ad8747 100644
--- a/TRRandomizerCore/Randomizers/TR3/TR3ItemRandomizer.cs
+++ b/TRRandomizerCore/Randomizers/TR3/TR3ItemRandomizer.cs
@@ -46,7 +46,7 @@ public override void Randomize(int seed)
             FindUnarmedLevelPistols(_levelInstance);
 
             _picker.Initialise(_levelInstance.Name, GetItemLocationPool(_levelInstance, false), Settings, _generator);
-            _secretMapping = TR3SecretMapping.Get(GetResourcePath($@"TR3\SecretMapping\{_levelInstance.Name}-SecretMapping.json"), IsJPVersion);
+            _secretMapping = TR3SecretMapping.Get(_levelInstance);
 
             // #312 If this is the assault course, import required models. On failure, don't perform any item rando.
             if (_levelInstance.IsAssault && !ImportAssaultModels(_levelInstance))
diff --git a/TRRandomizerCore/Randomizers/TR3/TR3SecretRandomizer.cs b/TRRandomizerCore/Randomizers/TR3/TR3SecretRandomizer.cs
index b4868e646..72533a27a 100644
--- a/TRRandomizerCore/Randomizers/TR3/TR3SecretRandomizer.cs
+++ b/TRRandomizerCore/Randomizers/TR3/TR3SecretRandomizer.cs
@@ -174,7 +174,7 @@ private TRSecretRoom<TR2Entity> MakePlaceholderRewardRoom(TR3CombinedLevel level
 
     private void ActualiseRewardRoom(TR3CombinedLevel level, TRSecretRoom<TR2Entity> placeholder)
     {
-        TR3SecretMapping secretMapping = TR3SecretMapping.Get(GetResourcePath($@"TR3\SecretMapping\{level.Name}-SecretMapping.json"), IsJPVersion);
+        TR3SecretMapping secretMapping = TR3SecretMapping.Get(level);
         if (secretMapping == null)
         {
             return;
diff --git a/TRRandomizerCore/Randomizers/TR3/TR3SecretRewardRandomizer.cs b/TRRandomizerCore/Randomizers/TR3/TR3SecretRewardRandomizer.cs
index aac54ff17..e1a4726ce 100644
--- a/TRRandomizerCore/Randomizers/TR3/TR3SecretRewardRandomizer.cs
+++ b/TRRandomizerCore/Randomizers/TR3/TR3SecretRewardRandomizer.cs
@@ -34,7 +34,7 @@ private void RandomizeRewards(TR3CombinedLevel level)
             return;
         }
 
-        TR3SecretMapping secretMapping = TR3SecretMapping.Get(GetResourcePath($@"TR3\SecretMapping\{level.Name}-SecretMapping.json"), IsJPVersion);
+        TR3SecretMapping secretMapping = TR3SecretMapping.Get(level);
 
         List<TR3Type> stdItemTypes = TR3TypeUtilities.GetStandardPickupTypes();
         // A bit cruel as rewards?
diff --git a/TRRandomizerCore/Resources/TR2/Environment/RIG.TR2-Environment.json b/TRRandomizerCore/Resources/TR2/Environment/RIG.TR2-Environment.json
index 462454a0f..a0ca40ed6 100644
--- a/TRRandomizerCore/Resources/TR2/Environment/RIG.TR2-Environment.json
+++ b/TRRandomizerCore/Resources/TR2/Environment/RIG.TR2-Environment.json
@@ -1492,9 +1492,15 @@
   "ConditionalOneOf": [
     {
       "Condition": {
-        "Comments": "If room 2 does not contain a secret, drain the plane area.",
+        "Comments": "If neither rooms 2 nor 96 contain a secret, drain the plane area.",
         "ConditionType": 1,
-        "RoomIndex": 2
+        "RoomIndex": 2,
+        "Or": [
+          {
+            "ConditionType": 1,
+            "RoomIndex": 96
+          }
+        ]
       },
       "OnFalse": {
         "Leader": [
diff --git a/TRRandomizerCore/Secrets/TR3SecretMapping.cs b/TRRandomizerCore/Secrets/TR3SecretMapping.cs
index 92c25dcaa..a2b48fe64 100644
--- a/TRRandomizerCore/Secrets/TR3SecretMapping.cs
+++ b/TRRandomizerCore/Secrets/TR3SecretMapping.cs
@@ -1,20 +1,25 @@
 using Newtonsoft.Json;
 using TREnvironmentEditor;
+using TRLevelControl.Helpers;
 using TRLevelControl.Model;
+using TRRandomizerCore.Levels;
 
 namespace TRRandomizerCore.Secrets;
 
 public class TR3SecretMapping : TRSecretMapping<TR3Entity>
 {
-    public static TR3SecretMapping Get(string packPath, bool japaneseVersion)
+    public static TR3SecretMapping Get(TR3CombinedLevel level)
     {
+        string packPath = $@"Resources\TR3\SecretMapping\{level.Name}-SecretMapping.json";
         if (!File.Exists(packPath))
         {
             return null;
         }
 
         TR3SecretMapping mapping = JsonConvert.DeserializeObject<TR3SecretMapping>(File.ReadAllText(packPath), EMEditorMapping.Converter);
-        if (japaneseVersion && mapping.JPRewardEntities != null)
+        if (level.Is(TR3LevelNames.THAMES)
+            && level.Data.Entities.Any(e => e.TypeID == TR3Type.TeethSpikesOrBarbedWire && e.Room == 8)
+            && mapping.JPRewardEntities != null)
         {
             mapping.RewardEntities = mapping.JPRewardEntities;
         }