Alien Bases

Alien Bases are ancient structures found in many different biomes. They were built by the Precursors around one thousand years ago. Four Alien Bases exist in total, on Mountain Island the QEP, in the Lava Castle the ATP, in the Lost River the DRF, and in the Lava Lakes the PCF. Alien Data Terminals can be found within each, explaining about the functions and purposes of the bases. While there are optional Alien Caches scattered throughout the world, these Bases are vital to the story and must be visited.

Locations
The Quarantine Enforcement Platform (QEP) is present on the Mountain Island embedded into the rock face. The purpose of this base was to shoot down "all vessels without proper clearance", preventing other races from coming to the planet, getting infected and spreading the bacterium when they leave.

The Disease Research Facility (DRF) is located in the Lost River. Its purpose was to conduct research on live specimens infected with the Carar Bacterium. It was destroyed by a Sea Dragon Leviathan, and thus is suspended at a crooked angle in a giant cavern, surrounded by skeletal remains.

The Alien Thermal Plant (ATP) is found within the Lava Castle, where it produces the power for most of the Precursor technology.

The Primary Containment Facility (PCF) can be found in the Lava Lakes, and is where the Sea Emperor Leviathan is encountered. This Alien Base also features arch rooms, linked to four Alien Arch Caches across Planet 4546B.

Gallery
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Trivia

 * Models for the Quarantine Enforcement Platform and various parts of bases were accidentally revealed during an experimental patch that added them into the entity gallery. A user on the forums revealed screenshots of the bases and they spread quickly. After seeing this, the developers quickly removed them and asked pictures of them to be prevented from spreading; they called it "a huge screw up".