And in something of a case of synchronicity, I found these pages when looking for a website I knew of that listed various experimental vehicles of WW2
Mail Online article: Inside France's secret World War I bunker: Urban explorers find wartime weapons stowed away in underground quarry
http://www.dailymail.co.uk/news/arti...nd-quarry.html
Gizmondo article: Secret Underground Bunker Is Full of World War Weapons and Military Vehicles
http://gizmodo.com/5906168/this-secr...itary-vehicles