How to complete Dark Ops challenge 3 (Cargo Supply Stash) in Blackout (Battle Royal) in COD Black Ops 4. This Challenge is called “Red Light, Green Light” and in order to complete it you need to be the first to loot the underwater supply stash at the Cargo Docks.
The supply stash can be found under one of the buoys on the left and right side of the ship. It seems like the supply stash does not spawn every match, but can always be found directly under the buoys if they appear.
So make sure you visit the Cargo Docks a couple of times to check these two spots and you should find the stashes.
Black Ops 4 – Dark Ops Challenge 3 (Blackout)
The Blackout Mode in Call of Duty Black Ops 4 has 9 Dark Ops Challenges. None of them have a description or location attached until you find the actual challenge and complete it. Once you complete a dark ops challenge you unlock a new calling card.