ARC Raiders Last Entry: Seed Vault Door, Hidden Key, and Documentation

Complete Furtive Meetings, accept Last Entry from Shani, and enter Stella Montis with a safe-pocket augment. The workstation, key, powered door, box, and extraction form one uninterrupted run.

The Seed Vault area draws raiders and ARC, so a practical loadout should protect you without risking equipment you cannot replace. If you spawn far from the vault, a fresh deployment may be safer than forcing a long crossing.

The Researcher's Log workstation is outside the vault. From the entrance, climb the short metal staircase heading east and check the wall-console row for the terminal with a bright red light.

Interact with that workstation before working on the locked door. You can complete this first step without entering the Seed Vault.

The hidden Seed Vault Box Key is in a small room near the outside workstation. Walk forward from the console row, take the first door on the left, and inspect the rack of hazmat suits against the wall.

1. Interact with the suits to reveal the quest key.
2. Check the floor and inventory before leaving; the item may need a separate pickup.
3. Keep the key for the terminal inside the vault.

The in-game box prompt calls it the Seed Vault Box Key; some guides shorten that to Seed Box Key. Hazmat racks also appear as quest props in The Stench of Corruption and Medical Merchandise.

The Stella Montis Seed Vault door needs power from a Fuel Cell. Search the immediate side rooms and Air Shaft corridor for the cell, then carry it to the machine beside the entrance and slot it in.

1. Inspect the door console and nearby power machine.
2. Search the adjacent rooms rather than crossing the map for a Fuel Cell.
3. Insert the cell and use the door when its state permits entry.

If the console remains locked after power is restored, recheck its current state and the immediate surroundings before abandoning the run.

Inside the Seed Vault, use the hidden key at the relevant terminal to reach the Seed Deposit Box. Search the box for the Official Shutdown Documentation and put it in your safe pocket at once.

Do not treat opening the door as quest completion. The Documentation is the item you must carry to extraction.

The Seed Vault Airshaft between Sandbox B and the vault is a nearby exit when it is active. Confirm the exit is available before committing to it; otherwise choose another open Stella Montis extraction route.

Keep the Official Shutdown Documentation in a safe pocket and leave without optional detours. Failing to extract with it in the same round means repeating the quest sequence.

Extract with the Official Shutdown Documentation to finish Last Entry, then claim White Indigo (Warden color) and 1 Yellow Light Stick Blueprint from Shani. The Documentation is a quest handoff item, so keep it protected until the extraction registers.

The Official Shutdown Documentation connects the Seed Vault finale to the MANTIKOR and Project Heartwood story. A Dead End introduces the shutdown, while Stable Housing, A Rising Tide, and Safe Harbor follow related research threads.

Last Entry closes Shani's Flashpoint sequence on Stella Montis. The chain runs from Fragmented Logs through Furtive Meetings to this Seed Vault extraction.

In My Image approaches the same Stella Montis Seed Vault area, and Furtive Meetings ends near the Cultural Archives staircase beside it. Do not confuse this vault with the separate Buried City seed-vault objective in The Root of the Matter.