you first go to steven to get dive and dive dvie
The submarine belongs to that scientist guy, you're not allowed on, you have to learn dive then find the place they are exploring, but there is a scale model of the sub in the museum.
there a dive area and once you dive there, there youll find the submarine but you really need to look. the entrabce is like entering a cave underwater
you have to dive underwater by sootopolis city and you have to go in the little cave underwater where youll find the sud and then you surface there.
It is almost exactly in between Sootopolis City and Ever Grande City on your map. Go there and dive underwater. Search around underwater and eventually you should find an underwater cave containing the submarine. When you find the submarine, head to the surface.
you will find team aqua in the under water cavern near the dive point in sootopolis
somwhere who ever wrote this is an idiot it is in route 128 i think find the longest dive point search and you will find a cave witha submarine inside dive up from there and you will find it
in your moms belly
Classified.
Steve
After you find the submarine you use dive up to the surface.
like 11,000 meters