Yes, it was a good day out Roy, only time I've ever visited mines of that nature. Some say the tunnels we crawled through were flooded as part of the process, I need to look into it more on day. Getting back up was fun, but not as bad as Port Mulgrove was when I was there, especially as it had had a recent landslip.
Uk Abandoned Mine Explores on YouTube : https://www.youtube.com/channel/UCsW2E1LQ7EETG9NQgij2dWA?disable_polymer=true