After the main story, Cayde-6 will give you a mission to place patrol beacons on the dreadnaught. This will lead to unlocking the area for patrols.
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Thank you - does that follow REGICIDE? (?). I thought that was part of the mission where you had to destroy the tank?
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It is after regicide
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okay - thanks for the update. Do you have any idea how to unlock it since I have completed those three tasks twice?
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Keep progressing the quest lines. You'll eventually be offered the quest called Dread Patrol.