. >> history awaits -- nick walenda and the wire and niagara are yours. >> reporter: walenda best known for walking across niagara falls on a tightrope. now says some circus accidents scud could be prevented if the engineers had stricter standards. >> 90% plus of the accidents in our industry that are, that cause death or serious injury are rigging related. >> reporter: in this case, suspicion has fallen upon the suspension of the chandelier structure. osha is investigating. and the company that owns and operates the circus, has promised a thorough review. >> we don't know exactly what happened. but we are going to get to the bottom of it. just make sure going forward, the performers safety is taken care of. >> if you watch the video. soon as the girls lift the legs up. a change in momentum. changes the load. they weigh 1,500. if they bounce or move. that magnifies and multiplies that load. that's where stuff can fail. >> samantha's injuries were less severe than the seven others still hospitalized. two with critical spinal cord injuries. >> i love these girls so much the we are family.