pretty new to this folks, looked so incredible, surely a tunnel system of this magnitude would have had more than one entrance? is it at all possible that a closer look and some research might reveal alternative ways to get in, I've just looked through the national archives for declassified material under the official secrets act and it seems that there is quite a lot of information, but none of which has been 'digitized' so you have to order the material, so not sure if it will help much but some contain site plans, maps etc.
Cross fingers.
I'm also aware that a public announcement of finds is pretty much a no!no!, can I just ask your advice on how its best to go about sharing information?