There will be many Genshin Impact kids who still don’t know the guide on how to get the hidden treasure chest in the sky in Genshin Impact 4.2. Next, the editor of Sourcecode.com collected and compiled the "Guide on how to get the hidden treasure chest in the sky in Genshin Impact 4.2". Children who have these questions should take a look. Take a look, I hope it helps you.
Answer: Use the spaceship to go above to get it.
1. Teleport to the anchor point in the sea to the left of the ruins of Fort Capdis.
2. Pick up the energy block, attack the energy mechanism on the spacecraft, and start the spacecraft
3. Wait until the water ring appears, click to interact, and you can go to the transparent stairs above.
4. Defeat the monsters that appear.
5. After defeating, you can get achievements and treasure chests.