Skip to main content

Call of Duty: Modern Warfare 3 Zombies: how to complete Bad Signal

Once Season 1 hit in Call of Duty: Modern Warfare 3’s Zombies mode, a new Act was added for players to dive back into the undead masses to complete more missions. Since this Act takes place after all the prior ones, it’s only natural that it puts players to the test.

The first mission in Act 4 is Bad Signal, which brings you to a new area that is more deadly than even the highest threat-level zones. If you’re struggling to survive this mission, we’ll give you clear instructions on how to complete Bad Signal.

Bad Signal guide

A triangle stone with a portal inside.
Activision

Once you’ve selected the Bad Signal mission in the main menu and dropped into the game, you will have a special symbol placed on your map. Take note of it and make your way toward it. When you arrive, you will see that you have been led to a rift you can interact with. If you’re on a squad, a vote will trigger that needs to pass to start the real mission.

This rift transports you to the brand new Dark Aether zone, where your objective is to activate and fill four seals around the area. You fill them by killing enough zombies near them to fill up their respective meters.

A soldier approaching a stone pillar in Modern Warfare 3 zombies.
Activision

The seals will be marked on your HUD and appear like small stone spires on pedestals. One of your squad mates must interact with it to activate it and create a ring of fire around it. This ring is the zone you must kill zombies within in order for them to count towards filling up the meter that will eventually break this seal. Because the zombies in this area are so strong, we highly recommend sticking together and doing each seal one at a time rather than splitting up and attempting to activate and destroy multiple at once.

A giant zombie worm in Modern Warfare 3 zombies.
Activision

Once you’ve filled all four, your goal will be to leave the Dark Aether; however, that doesn’t go according to plan. As soon as you approach the exit portal Gorm’gant, a giant boss worm will spawn that you need to take out. You’ll notice purple spots all around its tube-like body. Focus fire on those spots to damage it and keep your distance to avoid damage. Once you kill it, the mission will be complete.

Editors' Recommendations

Jesse Lennox
Jesse Lennox loves writing, games, and complaining about not having time to write and play games. He knows the names of more…
The best Call of Duty games, ranked
Soldier holding weapon in Modern Warfare II.

Few video game series are as influential and popular as Call of Duty. The annualized franchise throws players into fast-paced battles across various historical time periods -- along with fictional eras, as well. Call of Duty has taken us to World War II, the Cold War, a modern setting, and even to the future.

Although it's one of the most successful video game franchises out there, Call of Duty's quality varies significantly, with some fantastic entries in the series, but many mediocre ones as well. But which Call of Duty games are worth your time and which ones should you skip? To answer that question, we've ranked all the mainline entries in the series, with details about why you should or shouldn't play that particular game.

Read more
The best field upgrades for Modern Warfare 3 Zombies
A man holding a mysterious glowing vial.

Call of Duty: Modern Warfare 3's Zombies mode puts a slight twist on the mechanics you are already familiar with. It now plays much more like a souped-up DMZ mode rather than its old round-based format. And Field Upgrades have been modified in terms of both their effects and how you get them just for this game type. There are six different Field Upgrades you can bring into the map and use on a cooldown timer to help improve your chances of survival, but you can only pick one at a time. You will begin the game with only one option, but steadily unlock the rest as you level up. Once you have them all, the question then becomes which is the best Field Upgrade? We've managed to exfiltrate with the answer.

Healing Aura
Regardless of whether or not you're playing with a team or running solo, Healing Aura is no doubt the best Field Upgrade to bring on any Zombie run. When activated, you and any teammates in the area will not only gain immediate healing, but it will also instantly revive any downed teammates. The downside to all this power is that this upgrade has the slowest recharge time and is unlocked at level 19.
Aether Shroud
This is another upgrade that you will be glad to have. Aether Shroud makes you you temporary invisibile to all Zombies. This won't make you invincible, mind you, and PMCs can still take shots, but if you're getting swarmed and have no way to escape, becoming instantly invisible to a bloodthirsty pack of zombies can save your skin more often than you think. This upgrade has a medium recharge rate and is unlocked when you hit level 39.
Frenzied Guard
Just past the halfway mark, Frenzied Guard has a massive upside, but not without some risk. When you pop this Field Upgrade, you instantly repair all your armor, but also draw all the aggression of any enemy nearby for 10 seconds. However, another perk is that anything you kill during this time also repairs your armor, so situationally, it can be great or detrimental. This one recharges slowly, unlocking at level 9.
Frost Blast
Frost Blast does exactly what you expect: it fires a freezing blast that will slow down any enemy you hit with it and deal a bit of damage. It's decent in a pinch, but not a game-changer. You can get it when you hit level 29.
Tesla Storm
An odd ability on paper, Tesla Storm is only good if you have a team working together. Activating it will create a lightning chain between you and your team that will damage and stun enemies that get close to any one of you. It lasts for 10 seconds and can be great in the final moments while holding out for an extraction, but not in other situations. It recharges slowly and is the last upgrade you unlock at level 50.
Energy Mine
This is your default Field Upgrade, so it makes sense that it's the "worst" on the list. Energy Mine isn't exactly bad; you simply lay down a mine that does what a mine does -- explodes. It's just that setting up traps like this in Zombies isn't all that applicable except when kiting a boss around or waiting for the helicopter. It has a medium recharge speed.

Read more
How to fix packet burst in Modern Warfare 3
A soldier shields themself from an underwater explosion.

The last thing anyone wants to see when booting up a game like Modern Warfare 3 to head online with your friends is to be stopped by an error. Online games are susceptible to all types of problems beyond the player's control, leading to plenty of frustration and disappointment in a possibly ruined experience. While there are more substantial issues that can completely prevent you from playing, seeing the packet burst issue is almost worse because, while it does let you play, you will experience a ton of lag that makes the game essentially unplayable. If you've been struck by a packet burst error in Modern Warfare 3, here are some possible solutions so you can get back to fragging.
How to fix packet burst errors

If you spot a symbol of three squares on the left of your screen while playing Modern Warfare 3, it means you're suffering from a packet burst. This is essentially an error where something is messed up in the communication between your system and the game's servers, resulting in terrible performance. While it could be simply an issue on the server side and not related to you at all, which you can check by looking at the Modern Warfare 3 server status here, there are a few things you can do to potentially fix the issue on your end.

Read more