In October 1943, the U.S. Navy conducted a secret experiment of artificial strong magnetic field in Philadelphia, the famous Philadelphia Experiment, which successfully put a destroyer and all the crew members into another space. During the experiment, the experimenters activated pulse and non-pulse devices to form a huge magnetic field around the ship. Then the whole ship was shrouded in a ball of green light, and the ship and the crew began to disappear from people's sight. When the experiment ended, the ship had been transferred to the Norfolk dock 479 kilometers away. After that, some crew members still had the reaction of the experiment. Whether at home, on the street, in a bar or in a restaurant, they would suddenly disappear and reappear, which surprised the onlookers. The Philadelphia Experiment has far-reaching significance. It not only confirms the existence of another space in nature that we cannot see, but also shows the feasibility of temporarily putting humans and equipment into another space.