Given that its a considerable risk no matter how good your preperation and the consequences of the risk not comming off in your favour means risk for others. The question I need to ask is why?
OK so navy divers do it but they have a shed load of past experience and know how as well as the resources. Why not take up freediving and do 80m on a breath hold, Alun did it and he only learnt to swim a couple of years ago. Now thats a class dive
