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diff --git a/ocaml/test/old/test_pill_depth.ml b/ocaml/test/old/test_pill_depth.ml
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+++ b/ocaml/test/old/test_pill_depth.ml
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+(* Examine Pill Structure at Depth
+ *
+ * Maybe Arvo is nested inside the pill structure
+ *)
+
+open Nock_lib
+
+let rec find_gates noun depth max_depth path =
+  if depth > max_depth then []
+  else
+    match noun with
+    | Noun.Atom _ -> []
+    | Noun.Cell (head, tail) ->
+        let this_is_gate =
+          (* A gate has: [battery sample context] where battery is a cell *)
+          Noun.is_cell head &&
+          Noun.is_cell tail &&
+          Noun.is_cell (Noun.head tail) in  (* tail = [sample context] *)
+
+        let gates = if this_is_gate then [(depth, List.rev path, noun)] else [] in
+        let head_gates = find_gates head (depth + 1) max_depth (2 :: path) in
+        let tail_gates = find_gates tail (depth + 1) max_depth (3 :: path) in
+        gates @ head_gates @ tail_gates
+
+let test_pill_depth env =
+  Printf.printf "🔍 Searching for Gates in Pill Structure\n\n";
+
+  Eio.Switch.run @@ fun _sw ->
+  let fs = Eio.Stdenv.fs env in
+
+  (* Load ivory pill *)
+  let state = State.create () in
+  match Boot.boot_from_file ~fs state "ivory.pill" with
+  | Error msg ->
+      Printf.printf "✗ Failed to load pill: %s\n%!" msg
+  | Ok () ->
+      let kernel = State.get_arvo state in
+
+      Printf.printf "Searching for gate structures (depth 0-8)...\n\n";
+
+      let gates = find_gates kernel 0 8 [] in
+
+      if List.length gates = 0 then
+        Printf.printf "No gate structures found!\n\n"
+      else begin
+        Printf.printf "Found %d potential gates:\n\n" (List.length gates);
+        List.iteri (fun i (depth, path, gate) ->
+          Printf.printf "%d. At depth %d, path: [%s]\n" (i + 1) depth
+            (String.concat " " (List.map string_of_int path));
+
+          (* Try to call it *)
+          try
+            let formula = Noun.cell (Noun.atom 9)
+              (Noun.cell (Noun.atom 2)
+                (Noun.cell (Noun.atom 0) (Noun.atom 1))) in
+            let _result = Nock.nock_on gate formula in
+            Printf.printf "   ✓ CALLABLE! Path to Arvo: [%s]\n\n"
+              (String.concat " " (List.map string_of_int path))
+          with e ->
+            Printf.printf "   ✗ Not callable: %s\n\n" (Printexc.to_string e)
+        ) gates
+      end;
+
+      (* Also check: maybe pill is [type data] *)
+      Printf.printf "Checking if pill is a tagged pair...\n";
+      if Noun.is_cell kernel then begin
+        let tag = Noun.head kernel in
+        let payload = Noun.tail kernel in
+
+        match tag with
+        | Noun.Atom z when Z.numbits z < 32 ->
+            Printf.printf "  Tag: %s\n" (Z.to_string z);
+            Printf.printf "  Payload: %s\n"
+              (if Noun.is_cell payload then "Cell" else "Atom");
+
+            (* Try calling payload *)
+            if Noun.is_cell payload then begin
+              Printf.printf "\n  Trying to call payload...\n";
+              try
+                let formula = Noun.cell (Noun.atom 9)
+                  (Noun.cell (Noun.atom 2)
+                    (Noun.cell (Noun.atom 0) (Noun.atom 1))) in
+                let _result = Nock.nock_on payload formula in
+                Printf.printf "  ✓ Payload is callable!\n"
+              with e ->
+                Printf.printf "  ✗ Payload not callable: %s\n" (Printexc.to_string e)
+            end
+        | _ -> Printf.printf "  Not a simple tagged pair\n"
+      end
+
+let () =
+  Printf.printf "\n";
+  Printf.printf "═══════════════════════════════════════════════════════════\n";
+  Printf.printf " Searching for Arvo in Pill Structure\n";
+  Printf.printf "═══════════════════════════════════════════════════════════\n";
+  Printf.printf "\n";
+
+  Eio_main.run test_pill_depth