You can now find some new challenges in the latest update of MW3 Zombies. There are new missions to clear and new enemies to defeat. There is also a small Easter Egg where you can summon the Grreylorm Boss, a giant Aether Worm. But to summon the Greylorm Boss, you need to locate some secret USB sticks. They are not that easy to find, so we have put this guide together to help you locate them quickly. In this guide we will see where to locate all USB Sticks in MW3 Zombies.
MW3 Zombies USB Stick Locations
There are four USB Sticks that you need to find, and here we will see where they are located in MW3 Zombies.
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To locate the Calibration Data USB Sticks, you need to first make your way to any of the two locations we are about to tell you. The first location you can visit is the Orlov Military Base on the northeastern section of the map. The second area you can visit is the northwestern section of the map, above Levin Resort. There is a building in both of these locations where you can find picture locations stuck to the wall. Both the buildings will have the same picture, so you can visit either location to check out the pictures.
Once you make your way to the second floor of the building, you will find a map of Urzikstan and four pictures stuck around it. You need to take a look at the pictures and locate them on the map. These are the four areas you need to visit to activate UAV Towers. The locations are randomized for each match, so each time you will get a different map and locations to find. Now, make your way to these locations and activate the UAV Towers. Once you activate the towers, you will receive the USB Stick. Collect four of them and make your way to the Refraction Site to summon the Greylorm Boss.
How to Summon Greylorm Boss in MW3 Zombies
You need to find the Refraction Site on the map that will help you summon the boss. To find the Refraction Site, zoom into your Tac-Map to find two armor caches that are suspiciously close together. This is a dead giveaway that there is something strange happening here. These caches are usually located quite close to an Aether Storm, so if you spot a storm on the map, look around its parameter to find the Refraction Site.
You have to wait for the storm to hit your location to activate the Refraction Site using the USB Sticks. Wait till the timer countdown is nearing its end, as that is when the storm will start inching in. Before that, you can prepare yourself by killing zombies and farming points to purchase perks and gas masks. Once the storm is in your location, use the USB Sticks to activate the Refraction Site, then you can fight the Grelorm Boss.
That’s all there is to know about summoning the Greylorm Boss and all USB Stick locations in MW3 Zombies. If you like this guide you can check out our other guides as well.
