I was thinking recently how much money they could have save if they elimnated the torpedo loading hatch and loaded through the tubes like on the Kilos. It would require them moving at least two tubes above the waterline but that dosn't really chance the design much considering they would have been there already just on the next deck.
No loading hatch = one less hole in the pressure hull that could fail and one less hole to cut in the hull = less money spend on making it :hmm:
__________________
 
|