Is there any way to get geolocation from mobile without any network

newbie there.

I’m wondering, is there possibly a way to create an (Android/iOS, whatever) app that would locate the user as precise as possible but without any network? For example underground, where you can’t even call or send a text.

Is there any way that we can get the geolocation without these? It might sound like a dumb question, I just want to be sure that it’s 100% not feasible for now.
If you think there is way, even expensive or whatever it needs, please let me know.

Thanks!
Mike

yes, you can use GPS, bacause GPS can use only saltellite, so, you don’t need internet.

your can refer to this post:
Does GPS require Internet?