Kharon
Contributor
You said: "The reason that we don't plan for two failures is because if we did it would be impossible to plan a dive safely at all." Where did that statement come from? Statements like this are lame excuse for taking a risk rather than an honest effort at risk management/mitigation.
Not at all. It's simply accepting the limitations of planning. If you try to plan for every pair of possible failures the number of scenarios goes up exponentially. Which specific pairs of failures do you plan for or do you (pretend) to plan for them all? What about three failures? Or four?
Planning for every possible combination of events is impossible. The best we can do is plan for singletons and react to doublets or triplets on the fly. If you get bogged down with covering every scenario of all possible failures you'll be sitting on the shore forever instead of diving. And the chance of running into a doublet or triplet is very negligable if you handle the original singlet properly.