Well, I don't mean to sound at all "disrespectful" to either the Pampanito, Torsk or Requin, but there is one surviving USN WWII Fleet boat that stands above all others still surviving...the Silversides (SS 236), in Muskegon MI. In the water and very much in the same condition as when she "made her name", along with her sisters Wahoo and Trigger. She doesn't get nearly the attention that those other boats get, that are being preserved in more frequently visited big-city tourist traps...er, I mean tourist attractions...of course.
She is lucky, like Requin, in that she rests in fresh water; but they could all benefit from use of impressed current cathodic protection cables. Unfortunately, that is expensive and also a bit unsightly and could possibly present a hazard to unwary and/or unwitting guests.
If "push comes to shove" someday and any/all of those still afloat must be removed from the water to be preserved, let's hope they are placed in a setting like U-995, U-505 or the Drum (SS 228). At least, they should not be treated as badly as the Batfish (SS 310).