Ssn 509

I just watched Ice Station Zebra. What is the actual name of the submarine, SSN 509? (Or was the ‘509’ painted on the sail just for the film?)

The title should be SSN 509. Apparently the board changed it.

Tigerfish

From the IMDb

This (admittedly incomplete) list of U. S. submarines shows a gap in the numerical series surrounding “509” (which may have influenced the choice of the number since no “real” sub was identified in the movie).

SS 369 Ronquil

USS Ronquil Web Page A WWII sub, the sail was modernized in the 1950s, allowing its use as the purported nuclear SS 509.

Thanx, tomndebb. I had no luck searching for SS 509 or SSN 509, so I had an idea it was a fake number for the film; but I thought it was more likely that it was an actual number. Since few people would notice the number, I think few filmmakers would bother changing it.