An interesting bit of history: https://www.leamingtoncourier.co.uk/heritage-and-retro/retro/exploring-leamingtons-secret-tunnels-trailing-cobwebs-and-covered-in-dust-former-worker-emerges-to-confirm-there-is-a-second-tunnel-in-the-town-centre-3222520

That is interesting. I hope he succeeds in his quest.

I didn't know they existed until I read the article.

There's allegedly plenty under Coventry. I know of a few on the northern side of the city; one was used to break into a bank vault, another links a church to a pub!

I can imagine that there's loads of old tunnels & cellars under Coventry, it's been rebuilt so many times.