Bought the Revell Lionfish a few years back to build for a cousin of mine. His grandfather was a submariner in WWII. All I know is that he was in a Gato class sub. Have tried to find out which one but no luck so far. Every once in a while, when my hands are working OK, I open up as many of the holes as I can. I'm about 3/4 through. The sail is finished too. Hope I get to finish it and deliver it before I go to the great workshop in the sky. Hope it comes out 1/2 as good as yours.