Welcome to Blackreef is a Note in Deathloop .
Location
Found when equipping the Hackamajig during the second Loop.
Transcript
FROM: Colt
ADDRESS: 2nd Floor, Dorsey Square, Updaam
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Colt Note
You have a code, an address in Updaam , and your life.
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Notes
The door code to the Blackreef tunnel system is provided in this note, however, it is completely randomized for each player.