| Shelter Construction | Hardened Structures | Designs and manages construction of deep underground blast-hardened shelters and EMP-shielded infrastructure | hardenedstructures.com | |
| Shelter Construction | Vivos | Converts decommissioned military bunkers into co-owned, community-scale underground survival shelters | terravivos.com | |
| Shelter Construction | Radius Engineering | Manufactures and designs modular structural fiberglass-reinforced underground shelters | radiuseng.com | |
| Shelter Construction | Atlas Survival Shelters | Manufactures modular corrugated steel pipe and concrete-reinforced underground blast shelters | atlassurvivalshelters.com | @atlasshelters |
| Shelter Construction | Rising S Company | Produces custom-welded structural plate steel underground bunkers and survival infrastructure | risingsbunkers.com | @RisingSCompany |
| Shelter Construction | Defcon Underground Bunkers | Fabricates structurally reinforced steel plate shelters matching FEMA hazard mitigation specs | defconbunkers.com | |
| Infrastructure Hardening | Bechtel | Multinational engineering corporation capable of large-scale civil infrastructure hardening | bechtel.com | @Bechtel |
| Infrastructure Hardening | KBR | Global defense and infrastructure contractor providing engineering and logistics solutions | kbr.com | @KBRinc |
| Policy / Research | Federation of American Scientists | Policy research group providing data on nuclear threat reduction and stockpile tracking | fas.org | @FAScientists |
| Policy / Research | Electric Power Research Institute | Non-profit research group focusing on power grid resilience against EMP and high-altitude detonations | epri.com | @EPRInews |
| Policy / Research | Nuclear Threat Initiative | Non-profit focused on risk reduction, tracking global weapons usable materials, and infrastructure security | nti.org | @NTI_WMD |
| Civil Defense | The American Civil Defense Association | Operates the TACDA Academy to provide civil defense training on nuclear weapons effects, manual ventilation schematics, and shielding optimization | tacda.org | |
| Civil Defense | Doctors for Disaster Preparedness | Coalition of physicians and scientists focused on tactical emergency response, baseline radiation health metrics, and civil preparedness guidelines | | |
| Civil Defense | Core CBRN International | Delivers municipal and tactical consulting for CBRN hazard identification, decontamination, and local emergency response training | corecbrn.com | |
| Civil Defense | National Alliance for Radiation Readiness | Coordinates environmental and public health agencies to build localized radiation readiness toolkits and population monitoring frameworks | | |
| Shelter Construction | Andair AG | Swiss manufacturer of military-grade blast valves, gastight doors, and CBRN filtration systems; components form the backbone of Swiss public bunkers and European private shelters | andair.ch | |
| Shelter Construction | BSSD GmbH | German contractor installing modular blast shelters and custom structural survival bunkers with integrated Swiss-manufactured CBRN overpressure ventilation | bssd.de | |
| Shelter Construction | Castel Engineering | French protective firm fabricating specialized NBC airlocks, hatches, and blast-isolation valves for residential, corporate, and institutional clients | castel-engineering.com | |
| Shelter Construction | Subterranean Spaces | UK specialist designing and building bespoke nuclear bunkers and fallout shelters with HEPA/CBRN filtration, blast-hardened panic rooms, and underground residential conversions | subterraneanspaces.co.uk | |
| Shelter Construction | Oribe Seiki Seisakusho | Japanese nuclear shelter pioneer since 1939, building shelters to Swiss blast standards and distributing Swiss-manufactured CBRN air filtration systems across Japan | oribe-seiki.co.jp | |
| Shelter Construction | Biggar Bunkers | Canadian steel bunker fabricator and installer based in Saskatchewan; 26+ years building fallout, tornado, and disease shelters with automated fabrication at competitive pricing | biggarbunker.com | |