diff --git a/scaffold/deepdive/phase4/tts_pipeline.py b/scaffold/deepdive/phase4/tts_pipeline.py
new file mode 100644
index 0000000..6b3390a
--- /dev/null
+++ b/scaffold/deepdive/phase4/tts_pipeline.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+"""Deep Dive Phase 4: TTS Pipeline — STUB
+
+Converts briefing text to audio via Piper (local) or ElevenLabs (fallback).
+
+Parent: the-nexus#830
+"""
+
+# TODO: Implement TTS pipeline
+# - Load briefing from data/deepdive/briefings/
+# - Convert to speech via Piper (local)
+# - Convert output to OGG Opus for Telegram
+# - Save to data/deepdive/audio/
+# - Fallback to ElevenLabs if quality < threshold
+
+def text_to_speech(text, voice="en_US-lessac-medium"):
+    raise NotImplementedError("Phase 4 stub — implement TTS")
+
+if __name__ == "__main__":
+    print("Phase 4: TTS Pipeline — NOT YET IMPLEMENTED")