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Before you can begin working on the new Santeau Darknet File, you must first complete all three previous Darknet Files from the base game. The Darknet servers in this new file are as follows:

DF1_CAISSON
DF2_CAISSON
DF3_REBAR
DF4_CAISSON
DF5_CAISSON
Naturally, these servers are a little more complicated than those that came before, so if you're struggling right off the bat and need to grind out credits for more ammo/Booster Parks, or XP for stronger and more diverse augmentations, please refer below to "Excess Baggage Fees" for more information. Not only will the credit farming method transcribed there help net better items, but you will level up a decent amount and also unlock Expansion Items, which help boost your core HP and Energy stats when equipped in your loadout.

All in all, the objectives in each server are fairly straightforward and you should have no problem completing them with enough patience. As noted in the solution for "Hourglass," each Santeau server has a bottomless abyss, so you can always fall to your death after collecting the data fragments/downloading the data in order to respawn at the extraction point and thus avoiding the long trek back past the enemy AI.

Once you complete the final server in the case and the Picus newscasts concludes, the achievement will unlock.