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The steamworks is a massive series of conduits and machinery designed to help propel Mothership Zeta through space. It is a sub-area to the engineering deck and the second level encountered.
There are aliens and robots, alien turrets. The steamworks is one of the few areas that can be reentered after the player completes the main quest (This Galaxy Ain't Big Enough...) of Mothership Zeta, and the aliens therein may respawn more than once.