Death’s Door is a main mission in Horizon Forbidden West that begins as soon as you complete the previous main quest, The Embassy. The mission begins with a long and picturesque stroll, run, or experience to the location Aloy discovered during the last quest. The adventure continues past the wreckage on the coordinates, through a route left by Sylens and the Orb, and eventually brings you to a damage where you check for evidence of HADES on the Orb.
After eliminating HADES and meeting with Sylens, you’ll build an Igniter to transport yourself through a broken door into Latopolis. When you reach the north facet of the power, you’ll almost immediately notice that your path is barred by a bunker door that demands an entrance code. Enter the chamber by reversing the bunker door and switching left. Hold R3 to assess the Bad Urges knowledge level with your Focus. If you look at it in your Notebook, you’ll notice Travis mentions Sovereign 7482. As a result, the Death’s Door bunker code in Horizon Forbidden West is 7482.
To unlock the bunker door, enter 7 – 4 – 8 – 2 into the panel next to it, then go to continue investigating the facility and seeking for a solution to the inner gene-locked hatch.