The Type 091 (NATO reporting name: Han class) is a first-generation nuclear-powered attack submarine produced by China.

[4] China's nuclear submarine program, "09 Project", was authorized by the Central Military Commission and Mao Zedong in July 1958.

Work was slowed by the Great Leap Forward and the nuclear weapons program, which had priority and used similar resources.

One submarine shadowed the Kitty Hawk carrier battle group in October 1994, provoking a stand-off.

[12][13] Another entered Japanese territorial waters near Ishigaki Island (part of Okinawa Prefecture) near Taiwan in November 2004, causing the Japan Maritime Self-Defense Force to go on alert for the second time since the Second World War; China apologized for the trespass and blamed "technical reasons" on the submarine.

[3] They were later modernized with anechoic tiles, improved sensors and fire control, seven-bladed screw, YJ-82 anti-ship missiles, and possible the Yu-6 torpedo.

[1] In 1989, Pakistan made an abortive attempt to procure a Type 091 for US$63 million in 1992,[16] as a response to the Soviet K-43 leased to India in 1988.