Tunnels of Terror - Level 4?

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The "Tunnels of Terror - Level 3D, Section 2" has a passage leading to Level 4. I have been unable to locate that level anywhere. Is it a passage back to Rappan Athuk Level 4 or something left for the GM to expand upon?

Thanks!

Drcritique's picture

The ToT are connected to RA but RA is not connected to ToT. 

Hope you can understand my thinking.

Chaotic_Blues's picture

Level 4 is the Upper level of Orcus,