MS,
While I can understand your perspective you fail to consider the unexpected. In rough water (which can come up very quickly even on a beautiful day) you cant easily swim on your back. If you had to dump/lose your BC how are you going to swim? The snorkel will help you not get mouths/lungs full of water.
Just thoughts for consideration...
condor,
yeah, I think thats a good idea. its especially good in no visibility or darkness... the thing is that you and your buddy should practice with such a thing in good conditions first. Similar procedures are used during rescue/recovery dive team ops.
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