Where was your office? I can only speculate with so little information.

A company we were consulting for bought a big old country house here in the UK. It was completely empty when my small team moved in. I took the massive library as my office.

Hah, sounds like a quick getaway unless the tunnel was leading to a private and usually unoccupied bedroom so that sir spending time in reading books did acquire a new meaning.

It quickly led to the front door. Visitors would be forced to walk half way round house to get there, to impress them I guess.

Good story.