https://en.wikipedia.org/wiki/Soviet_submarine_K-129_(1960)#...
The K-129 was diesel-powered: https://en.wikipedia.org/wiki/Soviet_submarine_K-129_(1960) The missiles were nuclear-tipped, though. More reading: http://military.wikia.com/wiki/Soviet_submarine_K-129_(1960)
Source: US Navy submarine nuclear reactor officer, 20+ years
https://en.wikipedia.org/wiki/Soviet_submarine_K-129_(1960)#...
The K-129 was diesel-powered: https://en.wikipedia.org/wiki/Soviet_submarine_K-129_(1960) The missiles were nuclear-tipped, though. More reading: http://military.wikia.com/wiki/Soviet_submarine_K-129_(1960)
Source: US Navy submarine nuclear reactor officer, 20+ years