The K-222, previously known as K-162, is a notable Russian nuclear submarine distinguished by its titanium structure, earning it the moniker "golden fish." Launched in 1969, this submarine combined size, high power, and impressive speed, notably setting a world record with a speed of 44.7 knots during tests. As the only submarine of its kind from Project 661, it represents a significant advancement in submarine technology for the Soviet Union of its time.

The inception of the K-222 submarine was driven by the need to enhance the capabilities of previous submarine generations, which required surfacing to launch missiles and were thus vulnerable to enemy fire. In 1958, the Soviet Council of Ministers approved a program to develop a faster, deeper-diving nuclear-powered missile submarine capable of launching cruise missiles underwater. This project emphasized innovative materials and techniques while integrating advanced automation and more efficient reactors to achieve superior performance.

Following its operational service, the K-222 was officially decommissioned in March 2010, with the dismantling process completed by March 2015. Its legacy is significant as it demonstrates the evolution of naval warfare technology and highlights the Soviet Union's commitment to advancing military capabilities during the Cold War era.