You have to find a filter or 3. The infected inside do carry them sometimes. I like to have at least 2 full filters between all the partials. Even with that survival is not guaranteed. I dont loot the passage until ive found a punchcard and feel safe with the amount of filters i have. I usually just make my way to the center area and start looking in the industrial/infected for a punchcard. I then move towards the exit if/when i find that, looting along the way. Navigation is not hard once you know the layout.
Only mask no filter?
Hot bar your gas mask filter, so you can always see it's status. Bring 2-3 full filters.
Likely your filter ran out.
In "vanilla" deadfall, you just need a gas mask and filter.
You have to find a filter or 3. The infected inside do carry them sometimes. I like to have at least 2 full filters between all the partials. Even with that survival is not guaranteed. I dont loot the passage until ive found a punchcard and feel safe with the amount of filters i have. I usually just make my way to the center area and start looking in the industrial/infected for a punchcard. I then move towards the exit if/when i find that, looting along the way. Navigation is not hard once you know the layout.
If its gas, you need a full NBC outfit on. Else you get cuts.
Modded map, you dont need full nbc