For the survivalist who has almost everything...

This one gives a whole new take on the idea of "sustainable community"? sorry. Could not help myself.
From the company site:
"Trogonia 8 is composed of 8 Earthcom 100's each having an Earthcom 32 support module for long term power needs. Each Earthcom 100 arch system protects 250 people. The Mall style floor plan is designed with shops, City Hall, fitness center, restaurants, and a hospital all located on the main floor, condos located on the second floor, and food/storage on the third floor. The artificial sky inside provides a comfortable feeling for long-term protection.
"Wonder if these folks have done any projects for Dick Cheney?
Anyway, there are many ways to gather ideas about closed loop engineering. Here is another one.

http://www.bomb-shelter.net/