A password protected door leads to a secret stash. Passcode is "0340"

Anna and Langley's hidden stash in Sevastopol in Alien: Isolation.

Located near the Departures terminal

The most notable loot you can find here is a Medikit Blueprint

Puzzle solution[edit]

The passcode for this gate can be found in an email titled "Moved Our Stash" that can be accessed through one of the SEVASTOLINK Terminals

The passcode is: "0340"