Sad to hear about such a waste of life.
I recently trekked around Mt Dhaligiri in Nepal and returned via the Jomsom to Pokhara treking route. The route is quite heavily flown especially in the morning, as I believe local wind conditions prohibit landings at Jomson in the afternoon. I was quite amazed to see Twin Otters and Dorniers flying down the Kali Gandaki gorge (which is fairly wide) very low and below total cloud cover. With rising terrain entering the cloud either side of track. In the early morning at Poon Hill which is further down the gorge, aircraft where regularly flying at no more than a 100-300 feet agl as they crossed the last area of high terrain before the terrain fell away down to Pokhara. I kept thinking about what would happen if they suddenly entered IMC conditions or suffered an engine failure.