These are non current NOS underwater housings. I ended up picking one of these up for a Nikon P7100 several years ago and picked up the camera on ebay, total investment was roughly $200 +/-
I've used it in Hawaii and I've used it in the lakes around here. There's a learning curve to creating your settings as most of the cameras a guy would be looking at don't have auto settings for underwater, but there are youtube videos on it. I'm far from an expert and I don't know what you're experience is underwater, its alot of fun but you're really at the mercy of lighting, clarity, and depth. I'm pretty satisfied with the set up, I feel like its a little better option than the out of the box water proof cameras in the price range.
If I was doing it now I'd probably look at the Canon G7X and the corresponding housing.
A Gopro and set of red filters doesn't do a terrible job either, they don't have the range but they seem pretty forgiving.
I know that's not quite what your asking, but I'm throwing it out there as food for thought. Here is what my set up is capable of. The butter fly fish pic looks out of focus, but there was actually cold water and warm water from a volcanic feature mixing and thats exactly what it looked like.
Edit: I've had no issues with my housing, its worked perfectly, looking at feedback it looks like somebody did though so a guy would have to take that into consideration and check some reviews.