 At San Francisco s Presidio, with the hills of Marin County visible in the background, a crew of seven or eight men in bathing uniforms practice righting a capsized lifeboat. When the scene begins, the boat is on its side in the water, visible across the screen, with the men standing in the water holding the boat s sides, their backs toward us. They then pull the boat upside down, on top of them. Within a few seconds, they ve flipped the boat upright and they re all inside, the captain at the back.