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			 Yes you could fill the tank with water and pressurize it some how, in most cases it would only require 1 psi or less of additional pressure. A simpler approach would be to just use a fluid with a density 1.5x that of seawater. With a large storage tank and pump you could reuse the fluid indefinitely. 
		
	
		
		
		
		
		
	
		
		
	
	
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