There is a lot more than just putting a tank and find on and getting in the water. Serious ramifications will occur with small mistakes.
Of course there is. That's the whole point of takeing a class and not just renting gear and going for it. Like if you surface to fast you can get the bends.
You won't have a chance for the bends at the times and depths you will be at, but your point is valid nonetheless. Made me think of an experience of mine a while back...pulled it from my thread.http://wireefsociety.com/viewtopic.php?f=14&t=12900&hilit=whimsical
"Dive 3 - Rubiah Sea Garden -
Prepping for the navigation portion of my advanced, a last minute change leaving me scrambling to get in the proper boat and head off. Into the water, the flat mostly sandy bottom perfect for the exercises to be completed. Concentrating on my kicks and measurements to navigate and return to our original starting point, my gauges an afterthought. The final drill finishing, I glance at my dials for the first time.
Yikes!!! 20 bar!?! Banging on my gauge, checking to make sure it is not somehow stuck. I've only been in the water 20 minutes, how is this possible!?! Signaling to the instructor, holding up my gauges, instant confusion sprawled across his face. The gauge must be broken, just stay close and if it runs out, reach for mine, he explains.
Shortly thereafter, breathes becoming labored to the point it becomes necessary to grab his backup air supply. Left with no choice, we head to the surface.
Back in the boat, thoughts racing through my mind. My head spinning as I sort through the earlier events. Did I check my air four hours earlier when I was handed a new tank? I changed tanks right? Is this my setup or did I pick up someone else's? Unable to decipher the order of things, each dive muddled together. Each breakdown and setup feeling the same, it has to come down to two possibilities. I either was given a used tank and never checked or my air leaked in between the time I hooked it up and actually used it. I begin to remember the hose connected to my BCD being disconnected when I returned to my gear.
Either way, dodging a potential panic and bolt to the surface or to my instructor. A wake up to the attention to detail to avert disaster."