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Old 05-28-09, 05:34 PM   #7
CastleBravo
Stowaway
 
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I always thought it was about diving time. The outer casing by nature would trap air during a dive and thus slow the dive. The more wholes allowed more water in, displacing more air and making for a qhicker dive. The difference may only be 10-20 seconds, but that is an eternity when a destroyer is bearing down on you.
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