thank you!
I'm slightly curious about the name: 獄門島 seems to transliterate as Gokumon-jima, but with regard to this 1977 film specifically it does indeed seem to be most commonly written in romaji as Gokumon-to, although the 1949 and 1990 films called 獄門島 seem to be most commonly referred to in romaji as Gokumon-jima!