I love travelling to Cancun and the surrounding areas, and the bull shark dive.. sounds way fun. But I have blown my travel budget for the year with 2 weeks in Hawaii, a week in San Francisco, a week in San Diego, and several trips to Catalina. Maybe in a few months. I personally would not go to depths greater than a little over 120. I am just not comfortable without having a far greater understanding of the affects, and a lot more training. I may pursue that in the next few months, but for now, working upwards of 16 hours a day I don't know where I can find the time. The housing actually relies on a flat seal. We started with o-rings, and they were great. Very inexpensive, and reliable. But seapage was an issue when even the smallest item, be it sand, etc, would get in the o-ring seating area. I have 20 years in the water treatment/plumbing r&d field. O-rings are the best choice for a lot of reasons, cost, ease of use, reliability, except for in locations where the seating surface can become flawed. We found ourselves constantly worrying about the seal during beach dives. Sand gets into everything, and o-rings are better used with lube, sand and lube just wasnt our prefeered choice. We recently changed the design to a flat rubber seal. Our cost went up 20X for the seal, but the cost was still minimal. We have tested the unit to well below 500 feet, and we are hoping to do a 1000 foot drop in two weeks. I am just interested in getting video way beyond recreational limits. According to all my calcs, the 5" housing should withstand approximately 1500' prior to the lens failing. This is only on paper, but I still want to see one catastrophically fail just to know what the real limits are. The 4" housing should withstand over 2000'. I am trying to put together some interesting videos for the website. This housing is really meant for the diver who wants to video, doesnt want to risk losing their vid cam, and is on a very tight budget. This is not intended for the Discovery Channel, although we are in the process of designing an 8" housing that will look almost identical to the 4 and 5" housing to accomodate the larger HD sony units. They should maintain the 500' depth capapbilities, and be priced well under $400.00 We are still working on pricing from our vendors so don't quote me on the price yet. Thanks again for al the responses. And I am also looking for interesting, unique dive opportunities in the So Cal area. Again, my travel budget is shot, so the wife has limited me to So Cal.
Everything gets bigger. I once saw a Loggerhead the size of a small round dining table. If your game, I'll lead you down into the abyss of the Caribbean with you housing, just come on down! 
