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Thalassa is a moon of Neptune. An asteroid-like moon, its surface is filled with caves and amalgamated hills rich in phosphates and silicates. Little is known about its status in the present day, but fragments of a journal retrieved from a trash pile in Neomuna indicate that an individual from the city once visited the moon, hoping that the vast mineral and biological resources of the moon could be useful to the Neomuni, and discovered it to be inhabited by an unknown species of arthropod-like creatures. They also discovered a crashed ship, most likely Fallen in origin based on the design of several armor pieces nearby, one of which was a helmet seemingly designed to mimic the appearance of the local creatures.