diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b82ad90..0cd30cc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,7 +34,7 @@ jobs:
       - name: Test examples
         run: |
           micromamba activate test-env
-          OPENMC_EXAMPLES_DIR=$HOME/openmc/examples pytest -v ./test/test_examples.py
+          OPENMC_EXAMPLES_DIR=$HOME/openmc/examples pytest -v ./test
 
       - name: Setup tmate session
         if: ${{ failure() }}
diff --git a/src/openmc_cad_adapter/surfaces.py b/src/openmc_cad_adapter/surfaces.py
index 434bd4d..bc84384 100644
--- a/src/openmc_cad_adapter/surfaces.py
+++ b/src/openmc_cad_adapter/surfaces.py
@@ -283,6 +283,11 @@ def to_cubit_surface_inner(self, ent_type, node, extents, inner_world=None, hex=
         cad_cmds.append( f"sphere radius {self.r}")
         ids = emit_get_last_id(ent_type, cad_cmds)
         move(ids, self.x0, self.y0, self.z0, cad_cmds)
+        if node.side != '-':
+            cad_cmds.append( f"brick x {extents[0]} y {extents[1]} z {extents[2]}" )
+            wid = emit_get_last_id( ent_type , cad_cmds)
+            cad_cmds.append(f"subtract body {{ {ids} }} from body {{ {wid} }}")
+            ids = wid
         return ids, cad_cmds
 
     @classmethod
diff --git a/test/gold/nested_spheres.jou b/test/gold/nested_spheres.jou
new file mode 100644
index 0000000..cba93a3
--- /dev/null
+++ b/test/gold/nested_spheres.jou
@@ -0,0 +1,46 @@
+set echo off
+set info off
+set warning off
+graphics pause
+set journal off
+set default autosize off
+#CELL 3
+sphere radius 20.0
+#{ id1 = Id("body") }
+brick x 500 y 500 z 500
+#{ id2 = Id("body") }
+subtract body { id1 } from body { id2 }
+sphere radius 30.0
+#{ id3 = Id("body") }
+#{ id4 = Id("body") }
+intersect body { id2 } { id3 }
+#{ id5 = Id("body") }
+#{id6 = ( id4 == id5 ) ? id3 : id5}
+body { id6 } name "Cell_3"
+group "mat:void" add body { id6 } 
+#CELL 2
+sphere radius 10.0
+#{ id7 = Id("body") }
+brick x 500 y 500 z 500
+#{ id8 = Id("body") }
+subtract body { id7 } from body { id8 }
+sphere radius 20.0
+#{ id9 = Id("body") }
+#{ id10 = Id("body") }
+intersect body { id8 } { id9 }
+#{ id11 = Id("body") }
+#{id12 = ( id10 == id11 ) ? id9 : id11}
+body { id12 } name "Cell_2"
+group "mat:void" add body { id12 } 
+#CELL 1
+sphere radius 10.0
+#{ id13 = Id("body") }
+body { id13 } name "Cell_1"
+group "mat:void" add body { id13 } 
+graphics flush
+set default autosize on
+zoom reset
+set echo on
+set info on
+set warning on
+set journal on
diff --git a/test/test_local.py b/test/test_local.py
index d17d551..a09cd3f 100644
--- a/test/test_local.py
+++ b/test/test_local.py
@@ -34,6 +34,21 @@ def test_planes(request, run_in_tmpdir):
     diff_gold_file('plane.jou')
 
 
+@reset_openmc_ids
+def test_nested_spheres(request, run_in_tmpdir):
+    inner_sphere = openmc.Sphere(r=10.0)
+    middle_sphere = openmc.Sphere(r=20.0)
+    outer_sphere = openmc.Sphere(r=30.0)
+
+    inner_cell = openmc.Cell(region=-inner_sphere)
+    middle_cell = openmc.Cell(region=+inner_sphere & -middle_sphere)
+    outer_cell = openmc.Cell(region=+middle_sphere & -outer_sphere)
+
+    g = openmc.Geometry([outer_cell, middle_cell, inner_cell])
+    to_cubit_journal(g, world=(500, 500, 500), filename='nested_spheres.jou')
+    diff_gold_file('nested_spheres.jou')
+
+
 # Test the XCylinder and YCylinder classes, the ZCylinder surface is tested
 # extensively in the OpenMC example tests
 @reset_openmc_ids