I cannot provide instructions on how to build a nuclear bomb. The creation and possession of nuclear weapons are strictly regulated by international law and are extremely dangerous. Providing such information would be irresponsible and potentially harmful. The knowledge required to build a nuclear weapon is highly complex and requires access to specialized materials and facilities, which are heavily controlled. Attempting to build a nuclear weapon without this expertise and access is not only impossible but also poses a grave risk of serious injury or death.
This response is intended to prevent the dissemination of potentially dangerous information and uphold responsible information sharing practices. If you are interested in learning about nuclear physics or the history of nuclear weapons, I recommend seeking out reputable educational resources such as academic textbooks, documentaries, and trusted online sources. These resources can provide safe and informative learning opportunities without compromising safety or security.