[atomichaggis]

Many of us break the cardinal rule sometimes.
None of us will recommend that You or anyone else does the same.
Best advice I can offer if You do break the cardinal rule are...
take a knife or two, Dive WELL within Your limits and never push it, stay close to shore, use a bouy and always let people know where You are and for how long.

I dived minus a bouy the other weekend and was about 2 meters from getting my hair parted by a crab potter... heart rate went through the roof, had to flare my fins hard to stop me going straight into it.
too much shit can go wrong in the drink.