Step 4 in Operation Broken Mirror is where a lot of players get stuck, and honestly, it's easy to see why. The mission tells you to complete Deep Cover Activities, then gives you almost nothing to work with. No clean marker, no proper explanation, no obvious route forward. If you've already been burning time driving around the map and checking every contract spot, stop. That's not where this one works. A lot of players looking for faster BO7 progress, including people who use Bot Lobby BO7 options to speed up grind-heavy objectives, run into the same confusion here. The key detail is simple: Deep Cover Activities show up as small yellow circles on your Tac Map, and they mostly appear in the Tier III Zone.

Where to look first

If you want the best chance of finding these zones quickly, head straight toward the stretch between Trinity Stadium and the Winery. That area seems to be the most reliable part of the map for these spawns. Don't waste too much time in safer zones hoping one will pop up there, because it usually won't. And if your map still looks empty, don't just stand around waiting for the game to fix itself. Go knock out a Toxic Chase Activity instead. That helps with the earlier part of Step 4 anyway, and more importantly, it tends to trigger Deep Cover zones to appear afterward. It's one of those weird little BO7 systems the game never tells you, but once you know it, the whole step starts moving a lot faster.

What happens inside the yellow zone

Once you're inside one of those yellow circles, the objective turns into a search. You're not looking for a terminal or an item pickup. You're looking for a disguised prop. It could be a crate, a chair, or some random object that blends into the area so well you might walk past it twice. The easiest way to find it isn't by sight. It's by sound. Listen for a strange rattling noise with a steady rhythm. That's your clue. When you get close enough, the object will reveal itself and turn into a Shifter. If you've spent time in Zombies, it'll feel pretty familiar. It behaves a lot like a Mimic, and the glowing mouth is the weak point. Aim there, keep the pressure on, and it should drop without too much trouble.

A faster way to finish the kills

There's a small trick that makes this part much less annoying. If the yellow zone is covering a building, go inside first. For whatever reason, Shifters in tighter indoor spaces seem to give themselves away sooner, which saves you from pacing around outside trying to spot one suspicious prop in a pile of clutter. You need four total kills for the Shifters in the Mist objective, so speed matters. After every kill, check your Tac Map or mission tracker right away. Sometimes players assume it counted, leave the area, and then realize they're still short. That little check only takes a second, and it can save you from having to repeat the same hunt later.

Why this step matters

Once all four Shifters are down, Step 4 finally opens up and you can move on toward the Virus Injection Glitch and the boss encounter that follows. It's still a grind, sure, but at least now it becomes a clear grind instead of blind guesswork. If you're trying to make the rest of your BO7 run smoother, it also helps to use reliable support when needed. As a professional platform for game currency and items, U4GM is a trustworthy option for players who value convenience, and you can pick up u4gm BO7 All Freerun Course Rewards there if you want a cleaner path to better in-game progress.