A couple of clips from Frank Carlyle's DVDs.

http://youtube.com/watch?v=ZdBKg-KxHH0&mode=related&search=Liverpool%20History%20Unravelled%20Frank%20 Carlyle%20Carlisle%20Unnoticed

http://youtube.com/watch?v=yBCN99nYuS8&mode=related&search=Liverpool%20History%20Unravelled%20Frank%20 Carlyle%20Carlisle%20Unnoticed

apologies if these have already been posted.

Good videos
My grandfather walked through the first tunnel and I did the second