> We have submarines, mostly for the military, a bit of scientific exploration, etc... There's a special mention that deserves to be featured: submarines used

> We have submarines, mostly for the military, a bit of scientific exploration, etc... There's a special mention that deserves to be featured: submarines used for logistics in intercontinental trade routes: the infamous narco subs from south America cartels. Also, tourism subs exist, including those used in deep sea trips.