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I've never taken a class. If think that if I were in a team envionment that I'd get gas from a team mate, then turn off both tanks in the event of a o-ring failure in the manifold system. This would allow you to preserve as much gas as possible while you deal with the failure enough to start...

Team protocols. turn off both tanks, signal oog to team mate, share gas, deploy stowed second stage, and breath off it. Same minimum gas / rock bottom for any team based diving - enough to get you and a ream member to the surface while completing any deco.

I'm a pretty die hard DIR fan myself and I see the benefits of the z system from a team protocol situation, but that's where it pretty much ends. Generally, I think that the traditional sidemount regulator set up is the best current solution for side mount diving.

It's a misconception that with the z system that you will lose all your gas in the event of gas failure. You dive it with one tank turned off and swap based upon your current side mount gas management strategies. If a o-ring were to fail anywhere on the system, you have the capability of...

Running hp to hp on the first stages will not work either. you're not grasping how the first stages work. The UTD z system only allows you to breath the same second stage, while still managing the gas in both tanks by turming on off and the other on. It's only advantage is having the same...

Yes, you will need a spg on both tanks. The system doesnt equalize the pressure from both tanks. If you turned both tanks on and breathed them down, the first stage with the more sensitive pressure seat will drain first. it's unadvisable to dive the system that way. It's quirky and is npt going...

As long as the SI is at least 90 minutes, we don't adjust the profile at all. If it's less than 90 minutes, we double the stop times. It's never been a problem in our group because between dives we are generally gas blending, eating, and hydrating. Our typical SI has been 3 - 4 hours, unless we...

Hulu - NOVA: Extreme Cave Diving - Watch the full episode now.

i can fit wet notes, backup mask, and three spools into a single pocket. the zipper pocket is tiny - only big enough for a couple arrow or cookies.

deco and cave dives. pretty much any dive requiring a long exit. cold doesnt matter. the ice cream headache only lasts for a few minutes. :-D

I don't have v-planner at the moment, so I can't plug numbers into it. I was basing my answer off the experience with similarish profiles. While a second deco gas isn't needed, it's been my experience that I get out of the water with a little more spring in my step compared to a single deco gas...

agressive. Dive one looks agressive deco wise for the run time and gas choices. Doing the same dive with helium in the backgas and two deco gases would give me a similar run time. I'd expect more deco with air as a backgas and the single deco gas. Probably closer to 80 minute run time. it...

An AL40 does last about 30 minutes of deco as a 70 bottle, but there is more to it. Minimum stop times are applied to the various depths from 0 - 30, 31 -60, 61 - 90, 91 - 120, and 121 - 150 minutes of deco at the O2 Segment. Using Cascade Deco, you determine how much deco you need on O2 at 20'...

I've met and dove with some fantastic people from here. I'm fortunate to call many of them friends. :)

Thanks for the correction. I suppose it would have helped if I had read it sooner than two years ago. :) I just remembered that they were limited in scope of their application and was thinking that it was limited to about 30 minutes of deco. That said, if anybody is intersted in ratio deco, i...

Thanks for the history lesson as well as your contributions, Peaches!

Well, not exactly. For the referenced PDF's, dives with about 30 minutes of deco, each deep stop is 1 minute long and each deco stop is a minimum of two minutes long. I've done up to about 45 minutes with out changing deep stop times or the 2 minute minimum deco stop time. Beyond that, I'd...

It maybe the camera angle, but in pretty much all those pictures, the diver is at about a 45 or more degree angle. Even if that particular diver were able to achieve a better trim, he wouldn't be able to hold it while being perfectly still. He would have to constantly swim to achieve the trim...

Here are some examples of me and my transition to backplate and wing from a jacket BCD: This is June 2005 - somewhere between 50 and 80 dives. In the picture above, I was using a jacket BCD, which I had purchased straight out of my OW class. All my ballast were in weight pockets that were...