Crush
Contributor
Lake Minnewanka is a popular dive spot because it has the ruins of an old resort village that was submerged after construction of a hydroelectric dam in the 1940s.
But Parks Canada also warns that due to the high altitude of Lake Minnewanka and the typical depth of the dives, the time underneath the water is shortened dramatically. It also notes the cold water can pose a hazard.
I am pretty sure that a class will be doing the dam dive (which is a shore dive) rather than the town site (which is a boat dive or one hell of a swim).
Thanks, Parks Canada, for stating the obvious. I can't imagine that any instructor in the province would not have impressed the perils of cold water upon DCS and altitude effects on DCS to their students. Nevertheless, this student apparently did not make it to the surface, so DCS was assuredly not the issue. Unless the student entered the dam control house, there would have been no impediment to a direct ascent to the surface.
Very cold water can be hard on the old ticker. Wearing a wetsuit (an assumption) and hood and gloves and about 30 pounds of lead can be surprisingly restrictive and panic-inducing to a new diver. Since we are in A&I I will speculate that it was drowning due to panic or a heart attack.