In a career that's spanned more than 60 years, Robert Ballard has conducted over 150 underwater expeditions and made countless significant scientific discoveries.
원문출처 : https://www.cnn.com/travel/article/robert-ballard-man-who-found-the-titanic-cmd/index.html
원문출처 : https://www.cnn.com/travel/article/robert-ballard-man-who-found-the-titanic-cmd/index.html