diff --git a/Assets/_Project/Scripts/Client/Presentation/AmbientMotionSystem.cs b/Assets/_Project/Scripts/Client/Presentation/AmbientMotionSystem.cs
index 5241975a0..fb8d43050 100644
--- a/Assets/_Project/Scripts/Client/Presentation/AmbientMotionSystem.cs
+++ b/Assets/_Project/Scripts/Client/Presentation/AmbientMotionSystem.cs
@@ -24,8 +24,12 @@ namespace ProjectM.Client
     [UpdateInGroup(typeof(PresentationSystemGroup))]
     public partial class AmbientMotionSystem : SystemBase
     {
+        // 2026-08-08: seabed terms FIRST. The old list was pure LAND flora (bush/grass/flower/fern/cactus)
+        // from the deleted meadow + arid biomes, so it matched NOTHING in the shipping seabed arena and the
+        // whole walk-through rustle layer was dead. The land terms are kept only so an old scene still works.
         static readonly System.Text.RegularExpressions.Regex FloraName = new System.Text.RegularExpressions.Regex(
-            "bush|grass|flower|fern|groundcover|ground_cover|wildflower|clover|reed|succulent|cactus",
+            "floraclump|flora_|kelp|frond|seagrass|seaweed|coral|anemone"
+            + "|bush|grass|flower|fern|groundcover|ground_cover|wildflower|clover|reed|succulent|cactus",
             System.Text.RegularExpressions.RegexOptions.IgnoreCase);
 
         struct Flora
@@ -79,14 +83,22 @@ namespace ProjectM.Client
         {
             RestoreFlora();
             _flora.Clear();
+            // 2026-08-08: scan EVERY root. The old gate required a root literally named "BaseBiome" or
+            // "ExpeditionBiome*" — both went with the expedition, so this loop matched nothing and the rustle
+            // layer silently did nothing in the shipping arena. The seabed flora live under
+            // Env_SeabedKit/Seabed_Flora/FloraClump_N.
             foreach (var root in scene.GetRootGameObjects())
             {
-                if (root.name != "BaseBiome" && !root.name.StartsWith("ExpeditionBiome")) continue;
                 foreach (var t in root.GetComponentsInChildren<Transform>(false))
                 {
                     if (!FloraName.IsMatch(t.gameObject.name)) continue;
                     if (t.gameObject.name.Contains("LOD")) continue; // prop roots only; LOD children follow
-                    if (t.GetComponent<LODGroup>() == null && t.GetComponent<MeshRenderer>() == null) continue;
+                    // The sway unit is the CLUMP ROOT, which carries no renderer of its own — only children.
+                    // The old renderer-on-self test rejected exactly the object we want to rotate, so accept a
+                    // renderer anywhere beneath. Skip anything whose PARENT already matched, so we tilt the
+                    // clump once instead of tilting every stalk out of its socket.
+                    if (t.parent != null && FloraName.IsMatch(t.parent.gameObject.name)) continue;
+                    if (t.GetComponent<LODGroup>() == null && t.GetComponentInChildren<MeshRenderer>() == null) continue;
                     // 1.5b: ground-flush carpet props (Flowers_Flat, Grass_*_Plane) must NEVER root-tilt —
                     // any rotation lifts their edges off the ground; they stay fully static (shader wind only).
                     if (t.gameObject.name.IndexOf("Flat", System.StringComparison.OrdinalIgnoreCase) >= 0