MW3 Zombies Safe Cracker Guide: How to Exfil with the Cryo Freeze Formula

Craft the coolest ammo mod around with this formula!

by J.R. Waugh
Modern Warfare 3 Zombies MW3 How to Exfil with the Cryo Freeze Formula
Image: Activision

In the Safe Cracker mission in Call of Duty: Modern Warfare 3’s Zombies, you might be feeling like you’re retreading familiar ground. But the twist this time around is that you must Exfil with the Cryo Freeze Formula, so here’s how you can secure this mod in MW3 Zombies!

How to Exfil with the Cryo Freeze Ammo Mod Formula in MW3 Zombies

Just like with Uncommon Aether Tool Plans, you’ll get the Cryo Freeze ammo mod formula as a reward for completing the first 3 objectives in Safe Cracker in MW3 Zombies. The Cryo Freeze Formula will be in a Rewards Rift that opens once the safe is unlocked in a Raid Weapon Stash contract.

Image: Attack of the Fanboy

How to Complete the Safe Cracker Mission in MWZ

The Safe Cracker mission in MWZ is a revisitation of the Raid Weapon Stash, with several other missions often requiring you to use this contract. The objectives are the following:

  • Complete a Raid Weapon Stash Contract
  • Kill 30 Zombies attracted by the safe drill
  • Do not allow the safe drill to pause
  • Exfil with the Cryo Freeze Formula
Image: Attack of the Fanboy

Related: MW3 Zombies Freezer Burn Guide: How to Get Cryo Freeze Ammo

I’ve underlined objective 3 because this is the only moderately tricky objective for some players. You have to stay near the safe. The best ammo mod to have handy to ensure this is Brain Rot, and Speed Cola is a must. For Field Upgrades, Tesla Storm is best when you need some breathing room, although Energy Mine, Frenzied Guard, Frost Blast, or Aether Shroud all offer great defensive or evasive solutions.

Complete this, grab the Cryo Freeze Formula from the Rift, and raid the safe too! Then just go to an Exfil point, maybe consider training with any new weapons you found, and you’ll be able to craft Cryo Freeze ammo mods from now on!

- This article was updated on November 14th, 2023

About The Author

J.R. is a Staff Writer with AOTF and has been covering gaming and entertainment in the industry since 2022. Along with a B.A. in History from the University of Cincinnati, he has studied at the University of Birmingham, UK, and part of his M.A. at the University of Waterloo. You'll find J.R. particularly at home writing about the hottest manga and anime. He is highly passionate about horror, strategy, and RPGs, and anything about Star Trek or LOTR. When not ranting about fan theories or writing guides, J.R. is streaming his favorite RPGs and other forgotten gems.