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[PSUBS-MAILIST] Propulsion At Depth



Hi guys,
I am considering using steam (as in the steam jet that Juergen offered a while ago) to propell my larger submarine (10' hull width, 120' long, 2000' design depth. No, I don't have the money to build it- just a good imagination ;) ).
 
My question is this:
Is the effectiveness of any propulsion system, such as a propeller, hydrogen peroxide, steam, compressed air, etc, at depths over 500' increased or decreased significantly? 
 
If there was only a 5-20% decrease in efficiency at depths of more than 500 or 1000 feet, I don't think I'd change my plan.
 
Thanks for your help,
Alan