The main part of Fort Schoenenbourg is nearly 100 feet below ground. There are two major wings, one for living and maintenance and the second for weapons, and they are nearly a mile apart. The train would bring in supplies at ground level, and then a very large elevator would transport the train down to the main level. The main level had everything needed for self-sufficiency as seen below - generators, water processing, air filters [fear of poison gas used in WWI], kitchen, living quarters, clinic, and of course a wine cellar! The living was similar to being on a submarine - small with no access to light and fresh air.