Ok, i've read it all now, and can summarise.....
Its fascinating detail through 2008, during the intial digging, but then goes very very vague when he is visited by some old bloke who gives him some, what can only be, incriminating papers of information.
All we know so far is that its a German Tunnel and it could have occupied by a fanatical Nazi, who plotted for Germanys one last stand once Hitler had died. But surrendor followed and that never happended.
We await further updates, its VERY interesting, and will be ongoing for a while yet. The next "dig" (which is what most people want, pics!!) is due to happen when he has some building work done at home, end of the year apparently.
The story of the "papers" has to come out soon too.....