2.18.1. Life Support Utilities
   2.18.1.1. Atmosphere Systems
   2.18.1.2. Water Utilities for the Lunar Settlement
   2.18.1.3. Food Systems
   2.18.1.4. Radiation Protection
   2.18.1.5. Thermal Control Systems
   2.18.1.6. Contamination Control
   2.18.1.7. Waste Management