Officials are looking into what caused a 56-year-old Calgary man to die over the weekend while scuba diving in southwestern Alberta.

RCMP in Waterton Lakes National Park and the Calgary medical examiner's office are investigating the death.   

The man was diving with a group near the Waterton townsite when he was found unconscious in the water by another diver, according to RCMP.

He was quickly brought to the nearby shore, but resuscitation efforts were unsuccessful.