This has gotten me thinking a lot more about ditching. I don't generally elect to fly over water, but a lot of our instrument approaches and arrivals in the San Francisco Bay Area are over water. If your engine quits flying the RNAV RWY 2 to Watsonville or the ILS RWY 10 to Monterey, you're going in the water. Coast Guard studies suggest that a fit individual who survives the first minute will be able to swim for 10-15 minutes before hypothermia makes it impossible to control the muscles well enough to make forward motion (or tread water). Your survival plan needs to include flotation. Anyway, things worked out well for the guy in this story, but he was ditching in Southern California in a busy waterway with recreational boaters available for rescue.