Just eight people have reached Challenger Deep, the deepest point of the ocean. More than 550 people have visited space.
원문출처 : https://www.cnn.com/travel/article/astronaut-kathy-sullivan-challenger-deep-dive-scn/index.html
원문출처 : https://www.cnn.com/travel/article/astronaut-kathy-sullivan-challenger-deep-dive-scn/index.html