Moon Base

"The Moon Base" is an abandoned Gem base on the Moon. It was built for the use of The Great Diamond Authority and other elite-class Gems to plan the colonization of Earth.

Description
The Moon Base is an ancient tower which served as a place for the Great Diamond Authority to plan the colonization of Earth. On the first floor there are murals of Blue Diamond, Yellow Diamond, and two other unknown Diamond-class Gems. The second floor is mostly empty apart from a mysterious warp-like stream containing a round object in the middle of the room. The top floor is covered by a crystalline dome that allows for a panoramic view of Earth. In the center of the room, there is a raised platform with a single chair and a dashboard. The chair has an object embedded in its left arm, while the right arm has some of the controls used to access the computer. The top floor has a similar appearance to Yellow Diamond's Control Room.

Sub-areas
These are the three known rooms inside the moon base.


 * 1) Entranceway: The room is the lowest known level of the moon base. The four diamond symbol is depicted on the floor with each of the colors directed toward the mural of one of the four diamonds. The control surface of the staircase is located on a certain tile at the periphery of the room and composed a distinct material compared to the surrounding stone floor. Upon activation, it reveals the staircase to reach the upper levels. The room's only known door leads to the lunar surface with a pathway staircase outside and it must remain closed to prevent the base's atmosphere from escaping.
 * 2) The Mapped Room. The exact purpose of the room is unknown. With the walls layouted by circles.
 * 3) The Control Room: This room contains the main computer which holds information on the Cluster, the locations of the kindergartens, as well as the Homeworld's plan for the colonization and terraformation of Earth. 14 structures were originally built on Earth, which equals to 5% of the Homeworld's original colonization plan. Information stored includes the data for The Cluster and blueprints for several other Gem structures including the Lunar Sea Spire, Ancient Sky Arena, Sea Shrine, Sky Spire, Communication Hub, Galaxy Warp, and two other unidentified plans.

"It Could've Been Great"
The Crystal Gems and Peridot traveled to the Moon Base for information on The Cluster's location in Earth. Steven activated the computer on the top floor, allowing Peridot to find this information. Peridot showed the plans for Earth's colonization to the Crystal Gems, which upset them. Garnet destroyed the dashboard, shutting down the computer. Before Peridot left she took an object from the chair.

Trivia

 * Despite the base being made by and for Gems, the base seems to have some supply of oxygen as Steven is able to breathe for the entirety of their stay there. This could be used as a means to prevent explosive decompression.