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[–] jeffjeff ago 

Wow, is it actually a thing then? I was only joking. Never dived properly myself but I can get to the bottom of the deep end at the pool without assistance :)

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[–] Horsearooney 0 points 2 points (+2|-0) ago 

Yeah, I'm 180cm, 88kg (53 yr old) and use about 12kg. The whale (the subject in q of this thread) who I estimate weighs about 120kg+ would need over 20kg of lead to achieve neutral bouyancy.