G.A.R.M. (mission)

M13: G.A.R.M. is a main mission in Deus Ex: Mankind Divided and the only one to take place in the Swiss Alps. After Adam Jensen finds out that G.A.R.M. is now being used by the Illuminati, he sets out to find answers.

Walkthrough
Chikane will fly Jensen in and drop him off near a back door. However, it seems Jensen was expected and a cutscene unfolds.

After you come back around, you have to make a choice on who to contact: Jim Miller or Alex Vega. If you are going for the Foxiest of the Hounds achievement, you must contact Vega, since contacting Miller will cause an alarm to go off later on in this mission. From the starting point, you can either remote hack (if you have the augment) a ladder to reach the ledge, or you can search around for another ladder to climb. Either way, after climbing or jumping onto the ledge, you will reach a small locker room containing a shotgun, ammo and other items. Exit to the hall, and you'll reach the drill control room in Hangar 1. From here your objective is to get to the other side of Hangar 1, in order to reach Hangar 2. There are two ways to do this:

- Guns blazing through the main deck of the hangar. Note that, depending on difficulty level, there will be a number of guards, all of them augmented and packing heavy armament. It is possible however, to sneak past all the guards, in order to reach the other side of the hangar.

- Ice drill path (which unlocks the relevant achievement Core Driller). Insert a biocell in the ice-drill controls, press Left, twice Up, then Right and then the Activate Button, to use the drill to actually drill a new hole into Hangar 2. Remote hack the ladder to climb up above the control room, then use the scaffolding to go to the newly opened hole and into Hangar 2. Any way you use, upon arriving in Hangar 2, your objective is the same. You must get through it in order to reach the helipad. Again there are two ways in which you can navigate:

- Guns blazing through the main floor. Note that there are even more guards, cameras, turrets and box-guards, so you'll have to tread carefully. There is a way to sneak past all of them, however you will need to use cover spots and the Glass-Shield Cloaking augmentation (if you have it). At the end is the staircase which will take you to the top floor

- Ice drill path. Continuing from the newly opened tunnel, you can sneak around to reach the lift to the top floor without being noticed, except at the very end. This path will also allow you to obtain Marchenko's kill-switch (Damocles Sword), which you can use in the game's final battle to defeat Marchenko and obtain the relevant achievement Laputan Machine.

No matter which route you used, upon reaching the top floor, it is pretty straight forward, you just have to reach the lift that leads to the helipad. You can either sneak past or take-down the guards, depending if you are going for Foxiest of the Hounds or Pacifist achievements. While riding the lift, you will be contacted by Chikane, who is now waiting for you. Make sure to pick up any items you might have missed (the kill-switch can be obtained later on anyway), and when you are ready, use the VTOL's hatch to leave GARM.