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A Company That Vanishes Below is a world quest that can be accepted in The Chasm’s underground mines. The requesters are the Fatui – but this time they don’t want to cause trouble.
In order to start this quest, you must first complete the last part of the world quest The Debris of the Heavenly Stone, which will illuminate the underground waterway.
Related: How to get Haran Geppaku Futsu in Genshin Impact
Go to the area circled in the image above to find the quest. A blue exclamation mark will appear on the world map when you are nearby. You meet a group of friendly Fatui called the Ninth Company. They haven’t had anything to eat for a long time, so you have to give them something x4 of any raw food item.
After giving them the food, three Fatui members will appear and will go into battle against you. Defeat them and speak to Anton, who will then ask you to investigate why their supply chain was suddenly cut off.
Follow the quest marker to the main ad hoc tunnel and interact with the glowing notebook on the table in the highlighted area of the minimap. You receive Yanbo’s notes.
Once this is done, two Treasure Hoarders will spawn. defeat them before heading back to the Underground Waterway. Give Anton Yanbo’s Notes to complete this world quest.
Check out our guide on where to find the Ruins Serpent and farm Runic Fang in Genshin Impact to defeat the nearby boss.
https://progameguides.com/genshin-impact/how-to-complete-a-company-vanishing-into-the-deep-world-quest-in-genshin-impact/ How to complete A Company Vanishing into the Deep World quest in Genshin Impact