Quote:
	
	
		
			
				
					Originally Posted by  gobytron
					 
				 
				You mean by sealing and pressurizing it? 
 
That would sure give some peace of mind and you could market the heck out of that... 
			
		 | 
	
	
 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.