First, he directed the two highest-grossing movies of all time. Now, he's the third person in history to visit the deepest part of the oceans and the first since 1960. He took a solo dive in a specially-built sub.
Looks like he's making a documentary about it too.
BBC News - James Cameron back on surface after deepest ocean dive
James Cameron on Earth's Deepest Spot: Desolate, Lunar-Like