# | REQUIRED/OPTIONAL | OBJECTIVE | SPECIFICS |
1 | Required | Make contact with Skull Face | --- |
2 | Required | Acquire information from Skull Face | --- |
3 | Optional | Extract four Walker Gears | Fulton Cargo 2 upgrade required |
4 | Optional | Obtain the casette tape at OKB Zero | Found a[Subsistence] the elevator right before moving to Skull Face's helipad at the end |
5 | Optional | Extract seven red containers from OKB Zero | --- |
6 | Optional | Extract three tanks from OKB Zero | --- |
- Thi[Subsistence] mission takes place in a completely new area, OKB Zero. The only thing you have to do in order to complete the mission is to make it to the very end of the base. It's advisable to bring D-Dog along so he can spot enemies for you up ahead in this unfamiliar area.
- There are roughly two paths you can take, hugging either the left or right (northwest or southeast) walls of the area respectively. We'll take the left/northwest path for now.
- A[Subsistence] the start of the mission, hug the walls to your left and continue, curving around a rocky ledge to the far left. Climb some rocks at the end, then mark all enemies in the distance. It's not necessary to take out any of them (unless you want to fulfill all extraction objectives, in which case you'll essentially have to clear out the entire base); when the Walker Gear moves away from you, crouch and then crawl towards the wall and climb the crack, then climb the nearby stone ladder.
- From her[Subsistence] you should continue the way you've been approaching the base; keep hugging the left wall. Should you raise a guard's suspicions, be sure to take them out with a suppressed headshot ASAP and hide their bodies. You should arrive at archways sooner or later.
- Stay on the left/northwest side and head through the red door, but beware of the camera (both at the entrance and exit). If it spots you (or is about the trigger a combat alert), shooting it is a last resort measure, but it is best if you avoid being seen altogether.
- Try making your way to the stairs at the far end of the area via the upper walkways, taking down guards only when required.
- When you've reached the long steel staircase, head up all the way. (Should you have a combat status, enemies will not pursue). At the top, before going to the helipad right away, check out the elevator down below to find an optional cassette tape.
- Once you step up the helipad, the mission is essentially over.
- [Subsistence]-Rank Tips: Skip the scenes at the end of the mission to save time, and infiltrate the base at night to stay completely stealthy. The Sneaking Suit can help in that regard.