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sheck33 once bubbled...
I have done solodives, some pretty dumb ones in retrorespect at that, but i lived and learned and probably will not do it again, no matter how much redundancy you have you only have one main divecomputer (brain), if you pass out for whatever reason a buddy might very well save your life, when you are solo you probably die, no matter how redundant your gear is.
Just my 0.05c worth
Campana once bubbled...
I wouldn't cave dive or dive in open ocean or wreck dive solo (Actually, I have wreck dived solo but no penetration). I do not mind solo diving in the local scubapark to work on bouancy or weighting or swimming exercise. I too have had many buddies that were so inattentive that I was worse than solo because I had to worry about the other fool killing herself/himself.
Dave