Good luck. As mentioned already, P67 housings were custom-made to order and there's somewhere around a dozen in the world. I've done a bit of window shopping and they seem quite tough to find. That could probably be overcome by slapping a $5k offer on a board somewhere, but who knows? Again, unless you are willing to commit some pretty serious cash for a housing that will limit your number of shots, the P67 marine housing is a fantasy. You could try it in one of those plastic bags, but they just give me the shivers. I love my P67, but underwater's not the right place for it.
One way you could get around the limited number of shots would be a 70mm back with a Hasselblad, if it fit in the housing. It takes a bulk roll of film that's like 50 or 100 feet long, so you could get a lot more shots before having to surface and reload.
Not just to you (the OP actually said he was pool diving), but in general: give really serious consideration to whether you want to shoot film underwater. The Nikonos-V is a great tool and has amazing ultrawides, but instant feedback is king. You won't be doing that many dives, and underwater strobing does take some getting used to. What would take a few dives to get used to with digital can take a couple trips if you only get feedback once a day. If you're just that good, go hog wild, but underwater is an extremely demanding environment for photography. The Nikonos-V will help with this, because it can meter TTL during a strobe exposure. But, If I had $5k to blow on a housing, I would blow it on an Ikelite housing and a Canon 5d2, plus a good strobe.
If nothing else, consider taking along a second rig with a digital P+S and a housing, along with a small optically-slaved strobe. This won't set you back too far if you have the money for diving with medium format, and it will let you get some instant results for practice.
Last edited by PaulMD; 10-03-2011 at 12:08 PM. Click to view previous post history.