Well, perhaps submarine is not the right term for this vehicle. Rather, part of this boat is partially submerged so that users can comfortably view the world beneath the surface of the water. The Korean company Raonhaje makes this battery-powered vehicle which can reach speeds of five knots. You can view additional photos and a video at the link.
Link via DVICE | Photo: Raonhaje
Looks like it's inspired by or at least philosophically related to RQ Riley's Aquasub -- http://www.rqriley.com/aquasub.html