Oh yes, there will be sub wars in the future. I think a large portion of the future navies will be submarine, including carriers (think Sen Toku, only larger). We see a trend towards stealth in today's military tech - take the F-22 as an example.
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BTW, hacked 8k impulse, 8k range, 40 knot, 179 degree turn rate Zaunkonig II is killer. 
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