Jason, I really wish you'd get your head out of where you've been hiding it... No mention of pushing DIR has been made in this discussion, other than by you. While we're all having a civilized discussion, you're trying to turn it into a sh!t-slinging DIR vs. everyone else contest. Grow up!!
Having taking fundies (if what we took could be called a class, but that's a different story) doesn't (thankfully) make one a GI3 cronie, regardless of what you'd like to believe. As Soggy already stated, and something that apparently you weren't paying attention to while dreaming up ways to make an *** of yourself - not a single one of his, nor my certifications are through GUE. Neither one of us has been pushing the "GUE way". A mention was made by someone (possibly Soggy) that newer agencies such as NAUI and GUE are making strides in the right direction by taking a fresh look at things, but I'm pretty sure that was the extent of it. Now, if that's pushing the GUE dogma on you...
Soggy and I took the intro class because we wanted to learn the skills involved and get started on our road to cave diving. You have no way of knowing our intent as to whether to continue the training or not. You have absolutely no basis or right for saying what we plan or don't plan on doing in the future. Stick to your own diving ambitions on this.
And finally, our instructor didn't start this debate. The debate has been ongoing for a while, though perhaps in not so vocal a fashion. Our instructor simply brought it back to light, because it needed to be done.
As for the procedural questions:
No doubles in cavern - both myself and waterdawg have already answered that question in two separate posts. Once again, learn to pay attention. I'm not going to spoon-feed you the answer yet again.
Tanks blowing up - colorful way of describing a catastrophic gas loss. Might be caused by shearing off the burst disk bolt by making contact with the overhead. Not very likely on a typical single tank dive done in open water. Somewhat more likely in a cave. Also can be caused by a free-flowing regulator, which can empty a single rather quickly. Faster than many would imagine. Curt Bowen of Advanced Diving Magazine has done some objective tests previously, results surprised many.
-Roman.
Jason B:
So why not doubles in cavern? Isn't an overhead an overhead (just like a cave is a cave)?
How many single tanks go in the water on a daily basis in the world? How many are blowing up?
I still say this whole argument stems from the DIR-f grads trying to make every agency follow GUE and the GI3 mindset. Why didn't you guys seek out GUE training if this is such a concern? Certainly your instructor informed you that if you didn't have any intent on finishing the program, that you would be stuck in a single, so why all the gripping now? Finish what you started.
Another funny thing is that I know at least two off you screaming about this took your class from the instructor that started all this debate (on a different site).