MASS-Diver:Why are you diving that deep if you are a self-described "newbie"? Do you have an AOW card at least? Also, have you been taught how to plan dives at that depth or do you simply wing (return to the boat at 500psi or 100psi - without know why that number was choosen)? If you do not how to plan how much gas you need for dives and you are bad of air - that's an espically dangerous combination.
When diving solo I will occasionally go to 50 ft but my usual depth is 30-35ft. I dive to 700 psi and then come up. Yes I do have my AOW. I understand that at these depths I am able to come up should I run out of air. But doing a CESA presents a higher risk of DCS so I figured that at the depths I normally dive 13cft would provide the time to come up safely.