system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] How does Bruce conceal the true purpose of hidden compartments, trick doors, secret pathways, and concealed armories when he must clearly have the support of contractors, engineers, and laborers skilled in fabricating these things?
gpt
The Batcave was there before Batman was. In the Nolan Trilogy it was specifically called out as being used to hide runaway slaves as part of the Underground Railroad. It's therefore likely that the hidden passages in Wayne Manor that lead to it are also older than Bruce.

Hidden armories and such can be easily passed off as panic rooms or servants' corridors-- standard rich-guy security/lifestyle stuff.