I think as long as you apply common sense, training alone is safe enough. By common sense I mean that you keep a very large safety margin and never try anything even remotely resembling a "performnace" while alone. But I see no problem in short apneas as part of honing one's technique etc. But I would never, ever try to make a pb alone, or in fact get anywhere near my pb's. I simply like living too much.
Of course a bunch of people are going "oh come on man, please...You're just making too big of a deal".
But I have personally experienced a blackout in the pool - no waning. And I've seen so very many divers, to whom I've told time and again "beware of blackout, it strikes without warning" and they go on and do it anyway...And then they come and tell me "oh, this is what you meant".
The point being - you cannot know when you get a BO, your body's feelings, your previous performances etc cannot be used to determine it. All you can do is lower the probability of an incident to "safe enough" by having a huge safety margin. And by huge I mean:
-I never dive more than 25m in the pool alone, pb in dynamic 125m
-I never hold my breath for more than 2 minutes, pb over 7 min
And the nice thing is - I don't need to. I can train every aspect of diving within these limits. If I need to train the apnea part (pushing it) I either get a buddy or do it dry (which is very effective in that).
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Simo K
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