Silbury Hill 180
Image by photobabe

Give this man a shovel!!! ;-)

I think it should be really fascinating, and the pressure ought to be on EH to get the tunnelling right this time.

It's a great opportunity to put right the damage done by others in the past and to really Learn something about the mound.
As the infant mortality rate was extremely high in the neolithic the average age of the original builders was well below 20 (Neolithic Hoody's) and I'll bet they didn't bicker like those over 20 years old on this forum ;)