Far Cry 6: The Long Drop Mission

According to The Long Drop note, there are some supplies hidden away in this storeroom. However, it requires a key to get in. And unfortunately, your one shot at grabbing one is from a worker hanging from the broken catwalk at the center of the Reservoir. If you run over to get him, it will be too late and he'll fall. You can still get his key, though, you just have to close the sluice gate first. So, grapple across the catwalk - or use the ladder on the side to climb on top of the Reservoir and walk over - then head to the building on the opposite side. From the door here, hop up onto the roof to the opposite side and peak through the barred-up windows. You'll notice a lock on the opposite side. Shoot it, then climb back up onto the roof and over to enter in the now unlocked door. You'll notice a button on the side of a machine, a valve on the right wall, and another button on the wall you just came in from. In order to close the sluice gate, you'll need to hit these in a proper order. Thankfully, the answers lie just ahead in the office space on the left. Here, you'll find a note detailing the pattern you need: Activate the sluice control by the calendar Press the button on the side of hydraulic monitoring machines Turn the pressure valve Go back to the main console and hit the last button So, head to the button on the wall near the door you came in from. Hit that, then the button on the side of the machine, then turn the valve. Finally, come back into the office and hit the main console button. This will close the sluice for you, and now you can head back to the broken catwalk to find the worker. Grapple down to where he landed, take his key, then grapple back up and head over to the locked storeroom. Use it to open it up, and you'll get the Excavation Execution Shotgun and 150 XP from the Treasure inside.