The tragedy of the Titanic happened April 15th, 1912, and almost one thousand people died because of this event. In this most serious maritime accident in the world history, the real reason why the Titanic sank in the ocean is still a misery to the people living nowadays. My theory is the White Star Line Company, which is the owner of these two ships, changed the ship, and let Olympic replacing Titanic to achieve the voyage to go to America. The HMS Hawke smashed into the side of Olympic on 20th September 1911 after leaving Southampton. This crash caused serious damage to both ships, and Olympic's voyage had to be cancelled. While on a voyage from New York to Southampton Olympic lost a propeller blade after hitting a submerged object in the Atlantic on 24th February 1912. While at Belfast Olympic and Titanic were together for the last time. The expense of repairing the Olympic is very high and the insurance company refused to pay the money for repairing it. So the White Star Line Company planned the accident to hit the iceberg, and arranged another ship named Californian to rescue all the passengers. However, Californian didn't receive the message on time and the location of Titanic was wrong. Since 1912, several writers found that the SS Californian witnessed the sinking and the captain, Stanley Lord, failed to respond appropriately to signals of distress. The primary source I found mostly is about the general characteristics of the RMS Titanic and RMS Olympic. There are also some resources for the White Star Line Company. Because the thesis statement of this essay is still not proved, I need to find the resources that can prove my idea about the exact reason why Titanic is sunk. The source that I found clearly proved my ideas about the chance of switching Titanic and Olympic could be achieved. The first archival source I found is a photograph of RMS Titanic at the harbor at Belfast around late January 1912. In this photo, there is a