Secret passages are denied regardless of them being foreshadowed. There is a specific rules for them.
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Another question: Does the existence of the underground tunnels allow the existence of other subterranean rooms and not break Knox Rules?
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If the underground tunnel reaches the Mansion yes it works. The only problem is that there is no known entrance to that and that would make it a secret passage. Plus I don't know if that would qualify as part of the Mansion even if it was under it.