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I think that an argument could be made that some divers cramp, from keeping their breathing rate and heart rate so low, that they don't drive enough blood through the calf muscles for even the slight workload they are under.....That if they tried to work a bit harder, and breathed a lot more, they may not cramp....But this would be just one subset of people....assumption being that there are several a "different" categories of cramp--some people don;t get any of them, ever.