HKWorkoutActivityType.underwaterDiving The constant for underwater diving. Declarationcase underwaterDiving See AlsoWater activitiesHKWorkoutActivityType.paddleSportsHKWorkoutActivityType.rowingHKWorkoutActivityType.sailingHKWorkoutActivityType.surfingSportsHKWorkoutActivityType.swimmingHKWorkoutActivityType.waterFitnessHKWorkoutActivityType.waterPoloHKWorkoutActivityType.waterSports