Coast Guard Rescue

As America celebrates summer, we spend July 4 weekend with the largest and busiest Coast Guard air station in the country in Clearwater, Florida. Inexperienced boaters and swimmers alike make for a busy weekend for a station that conducts rescues across much of the Gulf of Mexico. CNN's Kaj Larsen embeds with the rescue swimmers who make a profession out of death-defying saves, sleeping in their berthing while waiting for the SAR (Search and Rescue) Alarm to sound. Don't miss CNN Presents this Sunday at 8:00 pm ET, replaying at 11:00 pm ET.