One says it's a Russian Delta IV (D-IV) class strategic nuclear submarine, and a search for "d-IV class nuclear ballistic missile submarine" in the Baidu encyclopedia entry also uses this photo. However, this is doubtful, as the D-IV class has a less pointed sonar cover. The cigar-shaped shape is typical of U.S. submarines (due to the use of concentric spherical array sonar), and since the bow rudder is vaguely visible, the Los Angeles class with a hulled rudder design can be ruled out, with the Seawolf or Virginia class being more likely.

Figure 2:

China's new ballistic missile experimental boat (conventionally-powered), replacing the No. 200 experimental boat, the official name of the submarine is unknown, commonly known on the Internet as the "Fathead Fish" or the "new 200 ship" submarine. It is used to test submarine-launched ballistic missiles.

The huge size of the command tower (because of the ballistic missiles to be accommodated inside), the chamfered angle of the tower and the layout of the drainage ports are all distinctive features of this submarine. You can also find more images of this submarine by searching for "fathead minnow submarine".