Sorry, Virgin. The first successful solo dive back to the bottom of the Mariana Trench was completed yesterday (technically on Monday, Guam time) by none other than filmmaker James Cameron. The joint effort between National Geographic, Rolex, and Cameron sent the director of Avatar and Titanic to the deepest point on Earth, some 35,756 feet below the ocean's surface, in a custom built submersible known as the Deepsea Challenger.
The dive marks the first solo mission to the point known as Challenger Deep, the first scientific exploration of the ocean floor there, and the first time a human has been down there since 1960. Find the NatGeo press release here, and highlights from the press conference here.