This is the Chinese narrative about what happened to the USS Connecticut submarine. They disagree with the United States. Who said that it collided into an undersea mountain. Instead they say that they damaged it intentionally to prevent the nuclear reactor from irradiating the Chinese shoreline.
Speculation from a different source that the u.s. sub may have been attacked by a drone sub https://militarywatchmagazine.com/article/us-scrap-3billion-submarine-accident