The whole dream was set like a TV advertisement/documentary.
The camera was above the ocean following a catamaran from a birds eye view. There were a couple of water skiers or surfers behind the boat. Then the camera left the scene and went toward the beach and the new view pont stopped behind some sand dunes.
All of a sudden we could see the ground moving from left and right, moving towards us. Then a guy in swimming pants came up from the ground on the left and from the right a little after that. They said this is a new thing to do, and they can move pretty fast underground. Then they both jumped into the dirt and "swam" away with a dolphin-like motion.