Describe a citadel
A CBRN shelter, it provides a gas tight state to the ships main compartments by increasing the atmospheric pressure within the ship above external pressure using air filtration units.
How do you enter and exit a citadel
You enter and exit a citadel via airlocks to prevent contamination within the citadel. Cleansing stations are located upon entry to decontaminate personal and clothing/equipment
How do AFUs work?
In Zulu Alpha state 1 the AFUs use 3 stages of filtration
1. a pre particulate paper filter that removes coarse particles including nuclear fallout.
2. a particulate filter that removes bacteria
3. a gas filter that removes gas and vapours using charcoal