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This article is about Alien Arch Caches. You may be looking for Sanctuary Caches, Alien Arches or Lost River Laboratory Cache.

These chambers contain Alien Arches and are scattered throughout the world, located in the Northwestern Mushroom Forest, the Crag Field, the Ghost Forest, the Floating Island, the Mountain Island, and the Bulb Zone. Each of these Alien Arch Caches is linked to the Primary Containment Facility, for the purpose of getting the ingredients for Hatching Enzymes, with the exception of the Floating Island Arch Cache, which is linked to the Mountain Island Arch cache. Alien Arches are one-way, and can only be activated by inserting an Ion Cube at the Principal Arch in the Primary Containment Facility or the Mountain Island Arch Cache. When a Principal Arch in the central hub is activated, the corresponding Auxiliary Arch activates and remains on, allowing teleportation in either direction.

This Alien Cache is found in a drop off beside the border with the Crash Zone in the Bulb Zone. It features many stalagmites and stalagtites within.

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It is located in the deeper areas of the Crag Field, and is notably larger than the other caches. It features many stalactites on the ceiling, with paths and trenches along them. Pink Caps and Speckled Rattlers can be found scattered along the whole Alien Cache. Cave Crawlers are present within this Alien Cache.

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This Alien Cache is found in a large cave within the Floating Island. The Alien Cache houses Speckled Rattlers and Pink Caps and various unnamed flora. It also has two entrances, the first is found in a small heap on the surface of the island while the other is found on a small ledge just above the lake in the middle of the island.

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This Alien Cache is located within the Ghost Forest, near the border with the Northern Blood Kelp Zone. Sometimes, the juvenile Ghost Leviathan in the area can wander close to the entrance. It contains Precursor Lamps, Ghost Roots, a single large Ghost Tree and two green brine pools. At the back of the Cache is the Alien Arch, which links to the Primary Containment Facility.

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This Alien Cache is found in a small cave near the top of the Mountain Island. The cave houses several clusters of Pink Caps and Speckled Rattlers. This Alien Arch Cache is the only one to have a Principal Arch as opposed to an Auxiliary Arch.

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It is found in a small cave in a trench near the outskirts of the forest, located south from the Giant Tree Mushroom. It features many stalactites on the ceiling and various types of unnamed Flora.

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