North Korea has put four government workers in prison. This happened because a navy ship did not start correctly. Kim Jong Un, the leader, said it was their fault because they were not careful. This information came from the news.

North Korea does not often punish its officials very hard when their weapons tests or military shows are not successful. This weekend, four officials were arrested. This shows that Kim wants to make his military stronger and make sure people follow rules in his country.

On Wednesday, a large warship was damaged while Kim was present. A part at the back of the ship came off too early during a special event at Chongjin port. Pictures from space showed the ship on its side with blue covers, and some parts were under the water.

Kim was very angry about what happened. This warship is the country's second destroyer, and it is very important for his plan to make the navy better. Kim quickly said that military leaders, scientists, and people who work at the shipyard were at fault. He said they were very careless and irresponsible, and that it was a "criminal act" because they did not use scientific methods.

The Korean Central News Agency said on Monday that police arrested Ri Hyong Son. He works for the Workers Party. He said he was "very sorry" that the rocket launch did not work.

On Sunday, KCNA reported that the government arrested three people from Chongjin Shipyard because of an incident. They were the main engineer, the head of the part that builds the ship's body, and the assistant manager.

Hong Kil Ho, who manages the shipyard, was also asked questions by KCNA news before.

On Thursday, North Korea's Central Military Commission told investigators that the people who did this bad thing will be punished. But we don't know what will happen to the officials they caught.

When Kim first became leader, he was known for killing many important people, including his uncle. People believe he did this to make his power stronger and remove anyone who could be a danger. Recently, there have not been many reports of killings in North Korea. Kim has become very powerful, like his father and grandfather.

Kim has given special help to scientists and engineers who work on weapons. He wants to make more nuclear weapons and missiles. He gave them new apartments in Pyongyang. Last year, a military spy satellite did not launch well. After this, he told his scientists that a failure is always a step to success. The government news said this.

Experts say Kim wants to make good progress with his five-year plan to make weapons. He started this plan at a big meeting in early 2021. Kim also said that North Korea needs stronger ships, missiles that can carry nuclear weapons, and other modern weapons. He thinks these are important because of increasing threats from the U.S. and its friends.

Last month, North Korea launched its first big warship. It weighs 5,000 tons. This ship is North Korea's biggest and newest warship. News from the country said it can carry different weapons, like nuclear missiles. Kim said building it was a big step for North Korea's navy.

North Korea said that the second ship was not badly damaged. They said that the side of the ship had some scratches and a little water got into the back part.

North Korea said on Friday that they needed about 10 days to fix things, but many people think the damage is probably worse than they said.