Like everyone here, I'm glad they made it. No doubt their survival course was a significant factor in this positive outcome.

Still, there are many worrisome details. Indications of inexperience perhaps? They were going deep into a little travelled area in the off season, in the Canadian Rockies, at a time of year when snow at higher elevations is common. Had they prepared for that possibility?

While seeking shelter, they got themselves wet, and then into an impossible situation. This amplified their problems. Perhaps the terrain left them no alternative?

They don't appear to have had individual kits, but rather were sharing critical items (knife, metal water bottle, firestarter). If they had become separated, would they have made it out?

Others have correctly noted the lack of basic signalling equipment. Navigation is also part of the picture; noting general direction on the way in can be a big help in finding the way out.

Despite all this, they deserve credit for positive actions and attitude in a difficult situation. We have all learned critical lessons the hard way.