DA Aquamaster:
Conditions and locations I am familiar and comfortable with, depth no deeper than 150 ft and run times no more than about 45 minutes with doubles, accellerated deco, and rule of thirds air planning. With proper configuration, redundancy and training, I don't personally see the need for a depth restriction as long as you remain well within your ability and comfort zone.
I actually prefer deep diving solo to deep diving with a buddy as it eliminates 1/2 the risk of failure, all the potential communication issues,and reduces the task loading required to keep track of a buddy.
Hi
Back to the thread.
I use the same rules when diving, and all my dives are solo, regardless if I am with some one or not.
If you can not take care of your self you are no help to anyone else.
However I have gone through all the postings in this thread and can only think of one other factor that has not been mentioned.
To service your own equipment.
To know in your own mind that your equipment will not fail, because you have the knowledge to properly check and maintain your gear before every dive.
My last TRUE buddy dive, was when I had just had my regs serviced at local dive shop and had them fail closed at 65 feet ,with my buddy 20 feet in front of me, with a hood on.
I am hamerring on my tank with butt of knife, to get buddys attention, who hears nothing, as I grab for my pony reg, that had been serviced at the same time.
First breath resulted in freeflow but still got me to surface in a controlled ascent.
I found out, in a regulator course, that the shop had just cleaned the hoses to make them look like they were serviced, and handed them back to me.
Now I trust no one with my gear, and it gives me peace of mind!