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Surveillance is a 
Promotion for the Spy in Civilization VI: Gathering Storm.
Effects[]
When counterspying, all city 
Districts are defended (+1 level at districts within one hex).
Civilopedia entry[]
Surveillance is the art and practice of methodically observing a target. Teams of trained observers trade off watching their targets, often using hidden microphones, telescopic photography, and other nefarious recording methods. While agents are sometimes trained in counter-surveillance techniques, it can be difficult for any agent to completely escape observation once they are captured in a surveillance net. An agent should assume that if they can see a surveillance team, that team wants the agent to know they are there.
