Just FYI, and btw this is incredible that it's modelled, but if you run on the surface at Full (flank) speed but with the forward and aft ballast tanks full, and the negative tank empty (yes it can be done and helps down down REALLY quickly without blowing through your attack periscope (AP) depth) then your speed is decreased from 17.7 to 13.
From talking with Neal, if you run decks awash, this too will decrease speed, but it's hard to do this solo, but I'll try and report back with findings.
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