For those who have not completed games in the Xenoblade Chronicles series, this page contains spoilers regarding the plot. Discretion is advised.
The Cylinder Hangar is a landmark in Xenoblade Chronicles. It is located in Colony 9, but can only be reached by going through Tephra Cave. This is the reason that Shulk, Reyn and Fiora enter Tephra Cave for the first time in the game.
Colonel Vangarre decides to send Reyn to fetch Ether Cylinders for the Mobile Artillery as a punishment for being late to his drill. As Reyn would rather not go by himself, he asks Shulk to come along. Fiora initially ignores them, but rejoins at the entrance to the Tephra Cave, near which the Cylinder Hangar is located. Inside the hangar, they encounter and defeat two Ancient Machines and recover the cylinders for the Mobile Artillery. Shortly afterwards, the Mechon attack Colony 9.
It is later revealed in a Heart-to-Heart - "Ancient Wreckage" - that the hangar is an ancient Alcamoth trading ship. However, Melia does not know of the reason a trading ship was in a lower region of Bionis, nor the fate of its crew.
- The Cylinder Hangar contains 1,579 Ether Cylinders. It originally had room for 1,668 Ether Cylinders, but 89 of them have been removed. Strangely, the number of cylinders in the hangar does not actually reduce after Reyn's party take some during the story.
- According to a short story in "Xenoblade: The Secret File", aside from cylinders the ship also contains a sealed regeneration chamber, which is used after the events of the game to restore Fiora's Homs body.