Alien Bases

The Precursor Bases are in-development stuctures. They were built by the Precursor race, and are to be located within the Mountain Island, Inactive Lava Zone, Active Lava Zone, and the Lost River.

Locations
By the Mountain Island a huge tower built by the Precursors will be present, atop this tower is a large "gun"

Trivia
On a Trello card the precursor gun was referred to as the precursor G.U.N, this is a developer joke as guns are not allowed in Subnautica, yet the models name is precursor gun.