It's not new. We used to go on these down in central Florida on family vacations in the 60's. Good touristy thing to do, not sure I'd want to own one.
What might be cool would be some sort of "window" in the hull, but you'd need to keep it clean. Then again, it would be cheaper and easier just to poke a camera on a stick down in the water and display it on a wide-screen TV.