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Knowing the local currents it the first thing that comes to mind! Thus the importance of a good guide or at least getting good info from the locals about the currents! If you know you might encounter these types of currents in the area you are diving, that's half the battle right there!!!!
Personally, I'd avoid diving an area, or a time frame when important upwellings or down currents are present (if they are tide dependant).
Just my 0.02$
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