Celerium - Intel 1

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At the aerial drone airfield, check the service garage behind one of the drones. Intel inside, moron outside!

Celerium - Intel 2

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Inside the secret James Bond-like facility, you will be surprised by two ASDs (automated sentry drones) before a staircase leading upstairs. In the hallway where your guy is flattened (cinematically) by the ASDs appearance, there is intel by an office window with a potted plant.

Celerium - Intel 3

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After freeing the magnetician (or "scientician") named Erik Breigner from the container, you will engage more hostiles. The back room of the lab will be blown open by an enemy ASD. Enter that "monster closet" (spawn room) and check the consoles on the back wall for this intel. Note that you pass through this room after you retrieve the Celerium device, but you can easily explore the place before opening the vault. This way, there are no enemies to harass you.