Extraction and survival

MW4 DMZ radiation storm, gas mask and the reactor

How the radiation storm closes Hajin, how long a deployment lasts, and what you need to survive the Haneul Nuclear Reactor.

Quick answers

How long is a DMZ match?
About 30 minutes, according to press at the review event. There is no official figure.
What do you need for the nuclear reactor?
A Gas Mask and Radiation Gear.
When can I print a Gas Mask?
The recipe unlocks at DMZ level 26.

How the storm works

Radiation spreads across Hajin during every deployment. Two things on your screen track it:

  • “Time Remaining” on the HUD counts down to the moment the storm next gets stronger.
  • The Tac-Map shows the radiation spreading across the map.

Activision’s Hajin guide tells you to head for an exfil as it worsens. If you stay too long you can end up cut off in an area that is too hostile to survive.

How long you have

There is no official match length yet. Press from the review event agree a deployment lasts about 30 minutes: PC Gamer says matches run 30 minutes and Nintendo Life says the countdown gives you half an hour at most. GamesBeat saw runs end after about 15 minutes with an early exfil, and others run past 40 minutes when squads stayed to the end. Both fit a storm that keeps getting worse after the first timer runs out.

The reactor and fallout zones

Some places are irradiated no matter what the storm is doing. The Haneul Nuclear Reactor in the north-east has a radiation cloud over it, and the official material says you need a Gas Mask and Radiation Gear to go in. Side Ops can also send you into fallout zones.

Gear What it does How to get it
Gas Mask Protects you in irradiated areas 3D Printer recipe from DMZ level 26
Radiation Gear Needed alongside the mask at the reactor Loot. Fire Stations are reported to hold it Unconfirmed
Radiation Blockers A consumable that reduces radiation effects for a while Printable, per Pocket Tactics. The cost is not confirmed yet

A tougher Durable Gas Mask appears as an Epic reward at DMZ level 68 in Activision’s level table.

Tips

  • Plan your route to an exfil before the second storm warning, not after.
  • If you go to the reactor, go early in the match with the mask and gear already on you.
  • Reaching the reactor by water is reported to be the safer approach. Unconfirmed

Still waiting on confirmation

We only state what Activision, Infinity Ward or the press have confirmed. These parts of the topic are not confirmed yet, and this page will be updated when they are:

  • Official deployment length and number of storm phases
  • Where Radiation Gear spawns (Fire Stations reported)
  • Radiation Blockers print cost

Published · last checked against Early Access (20 Oct 2026). Sources are listed under "Where this comes from" at the top of the page.

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