When it is submerged, it doesn't make any difference what color the ship is painted. Ever see the movie Operation Pink Petticoat?
Cary Grant, Tony Curtis.
and the great line = "Out of confusion comes profits". said by Tony, the boat's "scrounger".
I saw it, it was named 'Operation Petticoat' with no pink in it.
In the movie, the pink sub was sighted by the Japs and announced to their forces. We intercepted the radio message and were looking for it also because we had no pink sub and thought it was an enemy trap.
In the real world, movies are a welcome diversion and fantasy, but seldon reflect the real truth. I wouldn't build any strategy on what happens in a movie.