Astounding! Went as part of the Heritage Open Days experience. I had heard of the tunnels and been wanting to see them for some time . Guide Clare did a great job - informative and amusing - but nothing could prepare for how mind blowing the tunnels were. The sheer scale and skills on show and the thought of what remains unexcavated yet is something everyone should experience if they can. Many layers of history wrap their tantalising tendrils around you. A must see.
