Tethys Mara is a Maltropian naval shipwright headquartered in the city of Esrium. A subsidiary of civilian shipbuilding company Maritime Imperial, it was founded in 2009 to enter military markets. Its flagship products, the Gracchus-class and Belisarius-class ELINT ships, were a collaboration with Neu Engollon-based military support and logistics company Schwyz Logiztek.

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