Guides → Salt Storage code
Salt Storage code: I, IV, IX, XVI
Select I, IV, IX, XVI (1 – 4 – 9 – 16) on the Roman-numeral wooden lock, then validate the selection.
Where is the Salt Storage lock?
Chapter 4 (Time and Tide), in the Fish Market's Cutting Area on 1F — the Salt Storage door. It belongs to the "Sixteen Punishments of the Sailor" optional investigation; the clues are gathered from notes around the market.
How to open the door
- Reach the Cutting Area and remove the steam obstruction by using the Handwheel on the pipe above it.
- Inspect the wooden panel beside the Salt Storage door. It uses Roman-numeral buttons, not a four-digit keypad.
- Select I, IV, IX and XVI. The four values are square numbers: 1, 4, 9 and 16.
- Hold the validation control to open the door.
The nearby Locker Room safe is a different puzzle. Its code is 1496; do not enter that number on the Salt Storage lock.
What's inside
- Grenade launcher upgrade
- A lore note on the cult's ritual punishments
- Stomp the green figure on the floor for bonus Dream Essence
- Completes the investigation and unlocks The Damned achievement — see the achievements guide
Why IX is the third value
The clue follows the first four square numbers: 1, 4, 9 and 16. In Roman numerals those are I, IV, IX and XVI. A caption on one third-party walkthrough transposes IX as XI, but its walkthrough text and multiple independent code lists use IX.
Verified against GamerHour and Games Horizon (August 19, 2026). All codes: puzzle solutions.