Lomabuan

The Lomabuans were a sentient species that were native to the ocean planet Lomabu III. The species constructed cities of steel and stone on the coastlines of the planet's archipelagoes. However, during the rule of the Galactic Empire in the galaxy, the Lomabuans were held to be seditious, and by 3 ABY Lomabu III was entirely depopulated. The ruins of the Lomabuan civilization slowly dissolved into the surrounding oceans.