Ergo (Nemo III) is an inhabited ocean planet in the Nemo system, United Empire of Earth (UEE). Although today there is no indigenous life on the planet, the vast quantities of oil under its oceans suggests that at one point it supported an ecosystem of animals and plants. Paleontologists theorize that a mass extinction event took place roughly 300 million SEY ago. Because of the relative lack of land, the majority of Human settlements on the planet are situated on artificial islands and floating platforms. Oil and tourism are the main industries on Ergo. One of its main attractions is the planet's moon, nicknamed the "Space Whale" for its supposed resemblance to a whale, a large aquatic animal native to Earth (Sol III).