Overview
I ran into Alien Gray at Kulan Field around Omega Sector. He claimed that it's the Omega Sector, not them, that's been the bad one, and it asked me to help it invade the Sector by getting a number of materials from the Omega Sector Silo. I really don't feel good about helping it, but... oh well... I'll need to enter the Omega Sector Silo and bring out 3 Secret Documents.
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