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Little is known about Alterna, other than that it is a snowy arctic-like place where a rocket ship, statues resembling the moai of Easter Island and portable lab are seen. Fuzzy Ooze appears around the area, blocking several paths. In the single-player mode, the New Squidbeak Splatoon, consisting of Callie, Marie, the Captain, also known as Agent 3, and New Agent 3, are all present in the location. It appears to be located inside an Octarian Dome or similar location, based on the triangles in the sky. If you look closely, you can see an invisible manhole, also found in Splatoon and Splatoon 2's single-player campaign, presumably a level.
The history of Alterna is a mystery, but the rocket ship shows that it must have been there during human times, indicating that Alterna has been there since Pre-Splatoon Eras.