Talk:Meltdown/@comment-26270047-20150407140639/@comment-110.175.204.180-20150408031140

The third secret is actually the easiest of the three to find once you figure it out. It's basically the west storage room. The one with the most crates inside it.

Basically you have to enter that room first without opening any other room except hallways. The map down there shows exactly how to get the secret.