One said it was a Russian Delta IV(D-IV) strategic nuclear submarine, and the search for "D IV ballistic missile nuclear submarine" also used this photo in the entry of Baidu Encyclopedia. But this statement is suspicious, because the D-IV sonar cover is not so sharp. This cigar shape is typical of American submarines (due to the use of coaxial spherical array sonar). Because the bow rudder can be seen vaguely, it is more likely to exclude the design of hull rudder for Los Angeles class, Sea Wolf class or Virginia class.

Figure 2:

The official name of China's new ballistic missile experimental boat (conventional power), which replaces the experimental boat 200, is unknown, and it is commonly known as "Fat Head Fish" or "New 200 Ship" on the Internet. It is used to test submarine-launched ballistic missiles.

The huge size of the control tower (because it has to accommodate ballistic missiles), the chamfer of the control tower and the layout of the drainage pipe are all obvious features of this submarine. You can also find more pictures of this submarine by searching for "Fat Head Fish Submarine".