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		 Ever swam the water part of a triathlon? The stuff under the water isn't really so relevant since you're already getting thoroughly thrashed by the people in the water with you. 
 
Really, as I think about it the logistical concern I see is that while they will certainly have a way to get everybody out of the water I don't see any way they can engineer one where it will be a smooth continuous movement like hitting the beach of a pond. And if there is a backup of swimmers they're going to run into trouble pretty quickly. 
 
But I assume (or hope anyway) that they've go somebody experienced enough in planning to be thinking it through. 
		
	
		
		
		
		
		
	
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