Players who are successful will be able to enter the map's secret bunker and nab a Specialist Bonus, a Gold Gas Mask, and a secret Legendary "Red Room" Silenced SMG Weapon Blueprint for the Milano 821, which remains one of the better SMGs to use in September 2021.
The Warzone Rebirth Island easter egg remains one of the hardest in all of Call of Duty to finish, but completing it is well worth the luck, patience and coordination it requires.
- Locate the briefcase on the map, which has 11 different random spawns as shown mapped out by r/UlteriorCovert on Reddit. To avoid having to deal with the gas, try flying to one of the spawns in the pregame lobby as there's a chance the briefcase will reveal itself just before the timer reaches zero. Once located, the briefcase will be found open with three randomized photographs on the floor.
- Each of the three photos will indicate one of 26 parts of the the map that players will have to go to next. Each location will have a hidden sequence of two to three random numbers and some dash marks for players to jot down. For instance, looking at picture location 16 (Prison Lockers) in the map above, the code will be located inside the bottom grates of the lockers (e.g. -100), so players will need to have a sharp eye.
- To put the password together, the first code will only have a dash at the end, the second code will start and end with a dash, and the third and final code with only have a dash at the beginning (e.g. -100, -69-, 250- = 25069100).
- Enter the password into the number pad of the bunker's yellow door. The bunker is located in the Headquarters Command Center building. Once inside, players will be able to grab the Red Room blueprint for the Milano 821 SMG, as well as some powerups such as the Specialist Bonus perk.