“Which survivor?”
It would be necessary to study the images to see if they can be traced from their exit from the aircraft into the water. In any case, the person is on their back with the orange PFD collar supporting the neck and head with the rest of their torso and legs extending towards the camera. That is why others have noted you are seeing the foot and shoe, particularly the sole of the shoe. You can see how the PFD collar’s opening beneatht he chin is oriented towards the camera and not away as it would be if the person were face down towards the water.
So that person isn’t Yamamoto then?