Each Vivos operated shelter incorporates extensive nuclear, biological and chemical (NBC) air filtration systems that pre-filter all air before it enters the shelter, providing fresh breathable air for all occupants. These systems include HEPA, ULPA and TEDA filters to filter all contaminates, toxins, radioactive particles and harmful gases from the outside air before it enters the shelter.

Outside air is first pulled into the ventilation duct and first enters the HEPA/ULPA (Ultra Low Penetration Air) filter. This filter stage can remove at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a size of 120 nanometers (0.12 micron) or larger. This includes nuclear fallout dust particles, infection and contamination by airborne microorganisms such as molds and spores.

Next, air enters an Activated Charcoal Filter containing 100% ASZM-TEDA™ Carbon. This filter is designed to protect against cyanide, cyanogen chloride (CK), and a variety of other harmful gases. 100% ASZM-TEDA Carbon is the only grade of carbon that meets United States Military specifications. ASZM-TEDA™ is named for its impregnates: copper (A), silver (S), zinc (Z), molybdenum (M), and triethylenediamine (TEDA). This versatile carbon is designed to protect against many of the chemical weapons the government lists as potential homeland threats such as Nerve Agents, Vesicants (Blister Agents) and Blood/Choking Agents.

Additionally, many of our shelters employ automatically controlled air intake valves to seal the entire facility during any actual contamination event.

There are a number of air shafts that provide air to the facility. The shaft openings are hardened and designed to prohibit intrusion or blockage by any outside force, with a number of security measures.
All air vents and openings leading into the shelter also incorporate water proof gates and hatches that seal the shelter from submersion for the typical duration of a tsunami wave that may wash over the surface. While this is considered unlikely due to the strategic locations of each shelter, it is a concern that has been planned for.

Keep in mind that if a Vivos shelter is sealed due to outside contamination, or an environment that makes surface life unsupportable, then people would not be free to roam on the surface above. However, if it is safe to be on the surface, our defenses would make it extremely difficult for any intruder or force to approach and tamper with the air shafts or any other component of our shelters.