Seriously stupid
This is one very easy way to kill yourself. If you are interested in diving, search for your local dive club - they are always keen for new members.
Divers are incredibly happy to share their knowledge. I don't dive but two of my work colleagues do (one is an instructor) but they seem to be able to describe hundreds of ways they can kill themselves even after years of training and using professional kit.
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heyrudi has just found this setting, Tue 21 Jul 2015, 3:39,
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