In The Sinking City 2, there is a large safe in the changing room on the first floor of the CSimulator. To obtain the combination, you need to analyze clues carefully. The specific code for this safe is 1496, which can be found by referencing the documents "Sacrifice (Handle with Care!)" and "A Surprise in the Safe?".
How to Open the Safe in the CSimulator Changing Room in The Sinking City 2