Secret Laboratory is a hidden area located within a stone structure on the hot side of Hot and Cold in the Second Sea. It is an important progression area tied to raids and the Cyborg race questline.

The laboratory is found to the left of the building where the Smoke Admiral resides. Its inner section is a Safe Zone, allowing players to prepare without combat interruptions.

This area is especially important because it is used to start Order Raid encounters by using a Microchip purchased from Arlthmetic. After completing the Cyborg Puzzle, players can also unlock a hidden staircase, adding further progression tied to the laboratory.