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The gate covering the entrance to the downstairs portion of Poseidon Plaza will retract after you have used the Power to the People machine in the basement of Sinclair Spirits.

To do that, go into Sinclair Spirits & press the switch behind the counter. This will open the door to the basement where the Power to the People machine is located. Only after you have used the station to upgrade a weapon will the lower part of Poseidon Plaza open up.

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