How did you guys opened this

iirc you needed to do multiple other stuff in the entire region
as in seriously vast majority of the region
dont remember the exact item name you needed
[https://www.reddit.com/r/Genshin\_Impact/comments/16yzij2/how\_do\_i\_open\_this\_door/](https://www.reddit.com/r/Genshin_Impact/comments/16yzij2/how_do_i_open_this_door/) topic

You gotta collect bunch of strange ore and activate some strange mechanism underwater

I opened it by doing the quest

By finishing Iran's Uranium enrichment program.

I legit went on youtube and entered fontaine door puzzle..... First video was the solution pls people its not that hard