Dehumidification.
Common technique employed to prevent the development of corrosion (via the accumulation of moisture). Technique has commonly been employed in the cabins of military aircraft (eg. P-3C Orion) filled with avionics/electronic equipment to improve the serviceability of electrical/electronic equipment after long periods of inactivity/storage. Accumulation of moisture in cabins/equipment/electrical connectors/etc. have been shown to contribute to intermittent faults which are not readily replicated (No Fault Found) when equipment is bench tested in the lab/shop.