14-year-old Elliot Peacock was on the second day of a nine-day Acorn Adventure excursion when he died. Peacock, along with members of the 35th Glasgow Scout Group's Pegasus Explorer Scout Unit, was "gorge scramling" on Sunday at the Lillaz Falls in the Gran Paradiso National Park.
"On this particular occasion, the group were jumping from a height of approximately 60cm into the water, where instructors were waiting for them, as is normal," Acorn Adventure said in a statement.
"Water conditions were optimum for the activity and the weather was warm and sunny.
"As this participant entered the water for the second time, it was obvious to the instructors that something was wrong, so they rescued him from the water immediately.
"There was no obvious contact with a rock or anything else, so the reason for losing consciousness remains unexplained.
"Instructors who are trained first aiders and nurses who were also at the scene began CPR and continued until the air ambulance arrived 10 minutes after being called.
"Very sadly, they were unable to resuscitate him."
Acorn Adventure noted it has overseen gorge scrambling for five years and that "It is controlled by fully trained and assessed instructors and all participants are equipped with helmets, buoyancy aids, full wetsuits and footwear."
An investigation is underway.
Company founder and managing director Andrew Gardiner said his organization would continue to cooperate with officials. "Our priority is to ensure we do all we can to help them by working with the various organisations involved to understand how this happened.
"The rest of the group are supporting each other and showing great maturity. They are a great credit to their scout group and their parents."