Floor-plan tiers
- Compact Shelter: short-duration refuge with essential air, water, power, sanitation, and communications planning.
- Family Shelter: sleeping, storage, galley, sanitation, air handling, battery backup, and safe entry/egress zones.
- Extended-Stay Bunker: expanded living, food storage, mechanical, water, waste, medical, and maintenance spaces.
- Luxury Subterranean Suite: project-dependent comfort upgrades, private rooms, storage, wellness, command, and redundant utilities.