I have read that a fall of 250 feet into water is 95 – 98% fatal. As most people have heard it is not the fall that hurts or kills you but the sudden stop so to avoid being killed or hurt you should avoid the sudden stop. One way to do this is to fall feet first with toes pointed, knees locked, head up and hands stretched straight above your head. This streamlines your entrance into the water and reduces the suddenness of the stop it also increases your penetration or depth into the water so the water should be deep enough so that you do not hit bottom. I have no idea how far 3xk fell, how deep the water or how streamlined he entered the water but as well as I can remember I would think that it might have been possible for him to have sustained a concussion and possible memory loss. Maybe this explains why he has not been seen or heard from for about 2 years.