The Type 032 submarine (NATO code name Qing class) is a class of diesel-electric submarine currently undergoing testing in China's People's Liberation Army Navy. It is said to be the world's largest conventional submarine, at a submerged displacement of 6628 tons and is able to submerge for a maximum of 30 days. The Type 032 has a similar ventral "bay" to the Golf class submarine that protrudes downward.