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"