The Soviet Navy's Project 629, also known by the NATO reporting name of Golf class, were diesel electric ballistic missile submarines. They were designed after six Zulu class submarines were successfully modified to carry and launch Scud missiles. All Golf boats had left Soviet service by 1990. China built a single modified example in 1966 which is apparently still in service.
Sea - Military - Submarines
Links: en.wikipedia.org
By: kjfitz
http://www.fas.org/blog/ssp/2007/07/new_chinese_ballistic_missile.php