need help identifying structure

im not new to the game itself but im just now dipping my toe into the leviathan sized pool that is this games secrets and larger world. I just recently discovered this structure beneath the dessert, anyone have any idea what this may be? when I approached it it said "Discovered ???" so im not sure. any help identifying what this is would be nice, or at least a hint as to its purpose for spoilers sake

https://preview.redd.it/50u7z9tggvye1.jpg?width=1920&format=pjpg&auto=webp&s=27d3ff9f9bb29e513f08147f98c5a7a8ddf00df0

Posted May 5, 2025, 2:09 AM UTC

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