A scientist choses a busy day, when the sun draws a growing beach crowd, to test the life guard's physical and mental stress. Fitted with cardio-sensors and GPS, their heart-rate and distances are measured. A man in mysteriously rapid shock is diagnosed as being allergic to cold water. A daredevil waves Deano's advice and has an inexperienced friend set his dislocated shoulder back. Most time-consuming is the helicopter-assisted search for a drunk Irishman, who didn't drown in the shallow but wandered back to his car. After a 132 rescues days, heart-rates frequently doubling, tripling of worse, their job is declared the hardest of life services, equivalent to a whole rugby season in one week.