Red Doors in Warzone is a new addition to the game as part of Season 4.
Leaning into the Black Ops: Cold War storyline, these mysteriously appear across the map in a semi-random fashion.
Part loot source, part fast travel system, by accessing a Red Door location it'll take you elsewhere - one of several Stations across the map - with several high level gear chests for your trouble.
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What are Red Doors in Warzone?
Red Doors were teased with the arrival of the Season 4 release roadmap in an intentionally unclear fashion, stating "our intel cannot explain the origin of these mysterious red doors around Verdansk, but one thing is certain: They allow you to [[REDACTED]] around the [[REDACTED]]".
There's more in the original tease, but it's mostly just more REDACTEDs. Elsewhere, the patch notes simply say "Red Doors have appeared in Verdansk". So what does it all allude to?
Red Doors in Warzone can appear across the map in semi-fixed locations. Once you have found one, you can interact with it and step through.
This will then warp you across the map to another location - one of several Stations.
This location has a very Cold War vibe - including a chair in front of a number of monitors - but most importantly, two orange weapon caches, giving you a lot of high level loot.
From here, you can exit the room and continue playing the match. (For those curious, we visited a Station location in a different match and it was inaccessible from the outside, suggesting they are completely sealed off until someone using a Red Door travels there.)
Warzone Season 4 Reloaded is here! Check out the new Season 4 Battle Pass skins as well as how to find Red Doors, Uplink Stations and crashed Satellites and use Special Weapons for the Nail Gun. As well as new additions C58, MG 82 and OTs 9, learn our recommendations for the best weapons across the game, including assault rifles and popular choices such as the AMAX, AMP 63, CARV.2, FARA 83, Stoner 63, AK-47, Bullfrog, PPSh-41 and Swiss K31.
What we know about Red Door locations in Warzone so far
Here is where things get tricky. Red Door locations are seemingly fixed, but whether they appear at a given time or match is seemingly random.
We tested this by visiting one location, a mill west of the Airport on the far edge of the match, and found it would appear in some matches, but not others.
Here it is on the map, if you wanted to try it yourself (it's the north-most building of a cluster of three - you can see it clearer in the video embedded at the top of this page):
The behaviour of these doors is uncertain, such as whether they disappear after use. We know using a Red Door will take you to a random Station, so in theory it could just drop players to an unused Station each time it's used.
Due to the random nature of their appearances, at launch, confirmed locations are few and far between. Players are fast discovering examples, however - here's another found by Mr Middi on YouTube inside the Stadium:
And here's one which spawns inside Nakatomi Plaza (via FrenchFriesPancakes on reddit:
How this all plays into the strategy of Warzone will be interesting. In theory, if you know where one or two doors could spawn, trying your luck with them showing up can give you a significant head start - provided it takes you out at another part of the map that works with your strategy.
It also probably goes without saying to use these at your own risk once the circle has closed in. You never know where you'll end up after all!