submarines? Have you ever seen the tower they use for Submarine Escape Training? The one where you enter the pool 10 stories deep and basically surface on the air in your lungs? It trains you you to keep exhaling so your lungs don't expand as you surface. I never did that and I don't miss not having done it.
BTW, the last time I did the pool training it was salt water at 84°F -- really nice One hour, non-stop with a bunch of people watching people watching me -- great work-out.
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Better is the Enemy of Good Enough. Okay, what’s your point??
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submarines? Have you ever seen the tower they use for 
One hour, non-stop with a bunch of people watching people watching me -- great work-out.
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