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its in
ya mums bum
Follow the main mission then take the exit.
Still don't know look up a tutorial.
If you mean how do you get into Data Hive, You have to complete Tayari Plaza,Uplift Reserve, Kizingo Boulevard, ONI Alpha Site and NMPD HQ together.
Delfino Plaza floods once you've beaten Episode Seven of every level.
You have to unlock it through achievements.
Buck- Finish Tayari plaza on Normal
Dutch- Finish Uplift Reserve on Normal
Mickey- Finish Kizingo Boulevard on Normal
Romeo- Finish NMPD HQ on Normal
Dare- Finish entire Campaign on Legendary