Ever heard about the old underground passage rumored to run beneath the courthouse? I've started digging into the old city records and think there's a real story there. Care to help me sift through the clues?

I’ve pulled a few things from the municipal archives and some old newspapers. The courthouse was built on what used to be a warehouse district in the 1890s, and the city plans from 1888 show a set of tunnels labeled “Utility Passages.” The 1902 newspaper article mentions a “sudden collapse of a tunnel entrance” during a storm, but no one was injured. The city council minutes from 1903 note a “temporary closure” of the courthouse for structural repairs—no one mentions the tunnels. The 1934 map still shows the same set of passages, labeled “Access to basement.” The 1978 renovation plans indicate a new storm drainage system was installed, but no mention of any old tunnels. The only thing tying it together is that the basement has a locked room that was never opened, still sealed with a rusted iron gate. The gate’s serial number matches a batch of iron doors made by the same factory that supplied the courthouse doors in 1895. That’s the core of what I’ve found. Anything else you need?

I'll dig through the factory logs and see if they had a reason to hide the serials. The gate's maintenance log might give me the key—or the lack of one—so keep an eye out for that. Let me know what else turns up.