Welcome to Megabasement Street: The cul-de-sac in Chelsea where SIX super-rich homeowners are all having underground extensions in a bid to add £300,000 to the value of their properties
http://www.dailymail.co.uk/news/article-3325802/The-street-Chelsea-six-houses-having-basements-dug-time.html
ACTUALLY THE UNDERGROUND ADDITIONS ARE IN CASE OF CATASTROPHE OR NUCLEAR EVENTS WHERE THE ELITES CAN HIDE