Go at the old frontier in [-995,220,2905]
Click with the [Explosive] on the light block, it's the power source
Destroy the 4 [Crazy drones]
Go to the second turret in [-955,222,3053]
Destroy the cable
Go to the last turret in [-912,195,3131]
Hack the turret by collecting 8 [Datas]
Go back and talk to the [Exarche3 Manager] in [-634,162,3105]